ELECTRICITY & ELECTROMAGNETISM TRANSFORMERS + ETC

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "ELECTRICITY & ELECTROMAGNETISM TRANSFORMERS + ETC"

Transcription

1 Circuitry, Formulas & Electricity Ch5 Bushong RT Lect # 3 1 RT 244 WEEK 10 rev LECTURE # 3 ELECTRICITY & ELECTROMAGNETISM TRANSFORMERS + ETC BUSHONG CH. 4 & 5 REF: CARLTONS CH 3, 4 & 5 & PHYSICS CD 4 & 5 1

2 Wavelength is the distance from the peak of one wave to the peak of the next wave. Frequency refers to the number of waves that go by a specific point in one second. Remember that electromagnetic energy waves all travel at the same speed the speed of light 3 Measured in Hertz or angstrom 4 2

3 Electric Circuits 5 Modifying electric flow and controlling electricity results in an electric circuit. Electric Potential 6 Energy =?* Electric charges have potential energy, when positioned close to each other. * EMF 3

4 Capacitors A device that is capable of accumulating and storing an electrical charge 7 A parallel plate capacitor ELECTRIC POTENTIAL (EMF) Potential difference between two charges that makes the current flow (there does not have to be an actual flow just the potential difference The force or strength of electron flow Voltage is an expression of electric potential. electric potential is the ability to do work due to separation of charges The volt is equal to the amount of work (joules) that can be done per unit of charge 220 volts sent to x-ray machines Joule is the SI unit for both mechanical energy and work Work of a battery 8 4

5 VOLT= THE POTIENTAL DIFFERENCE Voltmeter measures the voltage across the circuit 9 Ammeter measures current Ohmmeter- measures resistance of one resistor in circuit switch must be closed for current to flow Properties Of Electricity Voltage Current Resistance the units of measure for electric potential (kev) = voltage current = amperage are the same units we use as technologists to express technical factors on the x-ray machine operating console. kvp is kilovoltage peak and ma is milliamperes. 10 5

6 CURRENT Rate of Electron Flow Ampere or Amp 1 Amp = 1 Coulomb Flowing In 1 Sec Ac = 60 Cycles Per Sec (50 cycles in Europe) People sometimes mistakenly use the word "volt" as if it referred to the current passing through a conductor. the Volt refers to the difference in electric potential between the two charges that make the current flow. The actual flow of electrons is current CURRENT (ma) The # of electrons flowing past a given point per unit of time. AC Alternating current when electrons flow in one direction and then the other DC when electrons all flow in one direction 6

7 Current flows in opposite direction of the electrons 13 AC electrons Flow Alternately DC electrons Flow in one direction Amperes = columbs/sec One ampere equals one coulomb flowing by in one second: Voltage and amperes are related in terms of how they affect the strength of an electric current. 1. A low-voltage, high-amperage current has many electrons moving 2. A low-amperage, high-voltage current with fewer electrons moving may be just as powerful because of the higher potential. Which one of the above describes the X-ray machine? 14 7

8 Resistance Ω ( OHM) Resistance is the property of an element in a circuit that resists or impedes the flow of electricity 15 The amount of opposition to flow Conductor material that permits electrons to flow easily Insulator - inhibits the flow of electrons OHM S LAW: V= IR States that the potential difference (voltage) across the total circuit or any part of that circuit is equal to the current (amperes) times the resistance. V = Potential difference in volts I = Current in amperes R = Resistance in ohms ( ) 16 V= IR I =V/R R=V/I 8

9 17 ELECTRIC CIRCUIT IS THE PATHWAY FOR ELECTRIC CURRENT What measures Electric potiential? Current? What are the definitions of each? State the meaning of Ohms Law V = IR 18 The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance. According to Ohm s Law, what would the voltage be if the resistance is 2 and the current is 4 ampere? A. 2 volt B. 4 volt C. 8 volt D. 10 volt 9

10 R = V/I 19 The resistance in a circuit is equal to the voltage divided by the current According to Ohm s Law, what would the resistance be if the voltage is 110 volt and the current is 5 ampere? A. 22 B. 55 C. 220 D. 550 I = V/R 20 The current across a circuit is equal to the voltage divided by the resistance. According to Ohm s Law, what would the current be if the voltage is 12 volt and the resistance is 1.5? A. 2 Ampere B. 4 Ampere C. 6 Ampere D. 8 Ampere 10

11 According to Ohm s Law, 21 what would the resistance be if the voltage is 220 volt and the current is 10 ampere? volts of potential difference causes a current of 2 ohms resistance What amperage is produced? 11

12 Transformers & Formulas Autotransformer Step Up Step Down TRANSFORMER FORMULAS (STEP UP OR DOWN) 24 V = voltage N = # turns p = primary s = secondary I = current Vp = N p Vs Ns Vp = I s Vs Ip Np = I s Ns Ip 12

13 Transformer Review 25 Turns Ratio N N S P Transformer Law N N S P V V S P I I P S The number of turns in the primary and secondary coils of a transformer determines whether it will increase or decrease voltage and by how much. In other words, the number of turns in the coil "cut" by this magnetic field determines the magnitude of the induced voltage as reflected by the transformer law formula: 26 Example: A transformer has 100 turns in the primary coil and 10,000 turns in the secondary coil (a turns ratio of 10,000/100 or 100/1). If 500V is applied to the primary side, what will the output voltage be? Calculate as follows: Vs/500V = 10,000/100 Vs/500V = 100/1 Vs = 500V x 100 = 50,000V Simply stated, if there are more turns in the secondary coil than in the primary coil, voltage will be increased. The opposite is also true: If there are more turns in the primary coil than in the secondary coil, voltage will be reduced. 13

14 Vp = N p Vs Ns 27 Transformer has a turns ratio of 1 to 200. There are 250 volts on the primary side, what is the voltage on the secondary side? 28 The Transformer has 100 turns on the Primary side, 100 volts and 10 amps. The secondary side has 50,000 turns of wire. What is the current AND voltage supplied to the secondary side? volts = kvp amps = ma 14

15 29 A radiograph using 200 ma 1/20 sec 55 kvp of a hand was taken in a 3Ø 12p room. What do you use in a single phase room? PROBLEM: 30 A TRANSFORMER HAS A TURNS RATIO OF 1:500 With a supply of 220 V and 50 Amps What is the KVP + MA supplied to the tube? 15

16 = 1 x = 110,000 volts x 500 x = 110 kvp (volts to Kilovolts remove 3 0 s - or move 3 spaces to the left) 1 = x x =.01 Amp or 100Ma = 100 (amps to milliamps move 3 spaces to the rt) X-Ray Tube Circuit 32 What is the turns ratio? 16

17 Vp = N p Vs Ns v = N p v Ns 500 Turns Ratio Transformer Review N N S P Step Up V I 34 Transformer Law NS VS IP N V I P P S Step Down V I 17

18 Transformer Law N N S P V V S P I I P S 35 The Transformer has 100 turns on the Primary side, 100 volts and 10 amps. The secondary side has 50,000 turns of wire. What is the current AND voltage supplied to the secondary side? volts = kvp amps = ma 36 What is responsible for supplying a precise voltage to the x-ray machine? THE TRANSFORMER 18

19 The Earth 37 A huge reservoir of stray electric charges electric ground 38 ELECTRIFICAITON OF OBJECTS FRICTION CONTACT INDUCTION ELECTRIFICATION BY CONTACT ELECTRONS LEAVE YOUR BODY CONTACT THE BALLOON 19

20 Electrification 39 Electrification = process of electrons being added or subtracted from an object Balloon rubbed against your head (Friction) Collects electrons from you - sticks to the wall that has a positive charge Shuffling across wool rug e on shoes Touch door handle e s want to escape (Contact) Induction electrical fields acting upon each other like in the circuitry of the x-ray equipment X-ray Tubes have complicated wiring 40 SERIES CIRCUIT (all circuit elements are connected in a line along the same conductor PARALLEL CIRCUIT (elements bridge the circuit rather than lie in a line along the conductor) 20

21 PARALLEL & SERIES circuit 41 EX: CHRISTMAS LIGHTS One line all bulbs go out Separate lines Only bulb burns out Rules for Simple Series Circuits 42 The total resistance is equal to the sum of the individual resistances. The current through each circuit element is the same and is equal to the total circuit current. The sum of the voltages across each circuit element is equal to the total circuit voltage. 21

22 43 Rules for Parallel Circuit The sum of the currents through each circuit element is equal to the total circuit current. The voltage across each circuit element is the same and is equal to the total circuit voltage. The total resistance is the inverse of the sum of the reciprocals of each individual resistance

23 Series Circuit Formula: 45 Current: I T = I1 =I2 =I3 Voltage: V T = V1 + V2 + V3 Resistance: RT = R1 + R2 + R3 Current: IT = I1 + I2 + I3 Voltage: Resistance: Parallel Circuit Rules VT = V1 = V2 = V RT = R1 + R2 + R3 (REMEMBER TO FLIP SIDES RT/1) 46 23

24 Review Problems on Handout Set up the formulas What is the total current in a series circuit with 3 resistances, each supplied with 10 amperes? 5. What is the total voltage in a series circuit with 3 resistances, each supplied with 10 volts? 6. What is the total resistance of a series circuit with resistances of 2.5, 4.2, 6.8? Review Problems on Handout Set up the formulas amperes volts , 4.2, 6.8 =

25 Review Problems on Handout Set up the formulas What is the total current in a parallel circuit with 3 resistances, each supplied with 10 amperes? 8. What is the total voltage in a parallel circuit with 3 resistances, each supplied with 10 volts? 9. What is the total resistance of a parallel circuit with resistances of 2.5, 4.2, 6.8? Review Problems on Handout Set up the formulas amperes volts 9. 1/2.5, 1/4.2, 1/ 6.8 = =.79/1 =

26 Find the Resistance: 51 What is the total resistance of a parallel circuit with resistances of 10, 10, 20? What about a series circuit? What type of circuit is this? 52 26

27 CIRCUITS 53 Short Circuit Resistance = Reduces The Flow Of Electricity (Too Much Will Blow Out Circuits) HIGHER RESISTANCE=LOWER FLOW Of Electrons FUSE ENCASED IN GLASS IN THE CASE OF A SHORT CIRCUIT THE HIGHER CURRENT WILL MELT THE FUSE STOPPING THE FLOW OF ELECTRICITY CIRCUIT BREAKERS HAVE REPLACED FUSES - POWER TOO HIGH IT WILL CUT OFF not damage appliance 54 27

28 55 A circuit breaker acts in the same manner as a fuse. If the current flowing through it rises above a certain level, the circuit breaker flips its internal switch to open the circuit and stop the electric flow. Any short circuit that lets the current rise to a dangerously high level will "trip" the circuit breaker and shut the system down. After the problem is corrected, the circuit breaker can be switched back on. ELECTRIC GROUND 56 2 WIRES CONDUCT CURRENT 3 RD WIRE CONNECTED TO A GROUND SOURCE KEEPS CURRENT FROM A LOOSE WIRE GOING DIRECTLY TO PERSON CURRENT ESCAPES THROUGH YOU 28

29 Ground to prevent shock - if there is a lose wire without a ground the electrons try to escape through your body Ground 57 A type of protection comes from a way of wiring circuits with an electric ground. Grounding is a process of connecting the electrical device to the earth via a conductor. X-ray imaging system 58 Convert electric energy to electromagnet energy. A well controlled electrical current is applied and converted to mostly heat and a few x-rays. 29

30 ELECTROMAGNETISM Electrodynamics study of electric charges in motion Conductor = electrons flow easily Insulator = electrons do not flow Semiconductors = some conditions behaves as an insulator and others a conductor. How the current gets to the TUBE Insulated cables 59 Magnetic force similar to electric force = Electric fields = exists around any charged particle Electromagnetism = fields When charged particles move = a magnetic field is induced Every moving charges produces a magnetic field 60 30

31 FERROMAGNETIC OBJECTS THAT CAN BE MAGNETIZED (IRON, COBALT, NICKEL) SIMILAR TO BALLOON 3 TYPES OF MAGNETS LODESTONE NATURAL (PERMANENT) ARTIFICAL N & S INDUCED ELECTROMAGNET temporary magnets produced by moving electric current 61 Ferromagnetic material such as iron attracts magnetic lines of induction, whereas nonmagnetic material such as copper does not. MAGNETS 62 USUALLY MADE OF IRON EVERY MAGNET HAS A NORTH AND SOUTH POLES LIKE SIMILAR CHARGES REPEL OPPOSITES ATTRACT 31

32 63 TESLA measurement of magnetic strength - used in MRI Demonstration of magnetic lines of force with iron filings 64 NORTH & SOUTH POLES If a single magnet is broken into smaller and smaller pieces, baby magnets result 32

33 65 A moving charge creates a magnetic field When a charged particle is in motion a magnetic force field perpendicular to the motion is created Solenoid & Electromagnet A coil of wire is a helix Supplied with current it is a solenoid SOLENOID: Current flowing through a wire coil of wire Add an iron core simple form of ELECTROMAGNET Putting a magnet in the middle of the coil of wire increases the strength if the electromagnet s magnetic field 66 33

34 ELECTROMAGNETISM 67 A MOVING CHARGE CREATES A MAGNETIC FIELD In Electromagnetism - MOVEMENT OF ELECTRONS IN A ELECTRIC CURRENT THAT CREATS AN ELECTRIC FIELD SEEN ON A COMPASS RT HAND RULE 68 Current flow direction of thumb Magnetic filed fingers An electric current is considered to be a + flow The negatively charged electrons are moving in the direction opposite to the current flow 34

35 RT HAND RULE 69 Direction of magnetic current lines When wire is looped magnetic field is strengthened = 2x more Adding more loops increases strength Magnetic lines curve around to other pole TRANSFORMER PRINCIPLE 70 When the wire that is conducing the current is looped The magnetic field is strengthened It is now 2x as strong The MORE the LOOPS The STRONGER the field INCREASE # OF COILS OF WIRE INCREASES THE VOLTAGE 35

36 Armature 71 A coil of wire that is rotated in a magnetic field More turns of coil the higher the voltage Look at diagram of x-ray tube Armature surrounds neck of anode How Electric & Magnetic Fields Interact 72 Faraday discovered that the magnetic lines of force and the wire must have a motion relative to each other to induce an electrical current 36

37 ELECTROMAGNET INDUCTION 73 Moving a wire through a magnetic field will induce a current (Faraday) Wire or field can move Moving a magnet through a coil of wire will induce an electrical current Faraday s Laws : or how to increase the strength of the induced current Increase the Strength of field or size of magnet Increase the SPEED of motion Change the ANGLE (more perpendicular) Increase the Number of Turns of coil 74 37

38 ELECTROMAGNETIC INDUCTION 75 3 WAYS TO CREATE MOTION BETWEEN LINES OF FORCE AND A CONDUCTOR Move the conductor through mag field Move magnetic lines of force Vary the magnetic flux 76 ELECTROMAGNET INDUCTION MOVING A BAR MAGNET THROUGH A COIL OF WIRE WILL INDUCE A CURRENT TO FLOW THROUGH THAT WIRE 38

39 INCREASING VOLTAGE 77 Increasing the number of coils of wire will increase magnetic field strength Increasing the number of coils moving in a magnetic field will increase the voltage induced Doubling the # of turns of wire = Doubles the Voltage INCREASING CURRENT 78 Increasing the strength (size of bar) of the magnetic field will increase the current Increasing speed of motion through wires will increase current 39

40 Increasing Current 79 2 turns of coil and moved 1 / sec 4 turns of wire (2x more) and moved 3/sec How much stronger is current? 2 x 3 = 6 times stronger Angle of motion 80 Motion of the wire perpendicular to the magnet (magnetic field) produces more current than a magnet that is at an oblique angle 40

41 Faraday s law? 81 Regulate the strength of the induced current BY INCREASING: of the Magnet of the motion of the magnet on the conduction coil Faraday s law 82 Regulate the strength of the induced current Strength of the Magnet Speed of the motion Angle of the magnet Number of turns on the conduction coil 41

42 AC magnetic field moves in and out MUTUAL INDUCTION 83 MUTUAL INDUCTION (STEP UP & DOWN TRANSFORMERS) 84 42

43 pg 95 Transformer Design 85 Closed core (open) auto Shell type SELF INDUCTION SIMILAR TO 2 COILS WRAPPED ON ONE CORE (Self induction occurs in single coil of wire the flow of electrons in one direction produces a current (in the same wire) then when flow of current changes polarity of magnet changes) 86 43

44 AUTOTRANSFORMER Autotransformer Self Induction There is only one wire but works like when there are 2 wires = The windings are used as the primary and secondary coils The induced voltage varies on where the outside wires are connected (KVP Taps) 44

45 TRANSFORMERS 89 STEP UP OR DOWN OPEN CORE, CLOSED CORE OR SHELL TYPE ABOUT 95% EFFICIENT AUTOTRASFORMER = induction Functions to provide Both types require AC for operation 90 A transformer with more secondary windings than primary windings. 1. has a greater secondary voltage 2. has a greater power output than input 3. is a step-down transformer 4. none of the above 45

46 Transformer Efficiency All transformers must operate on AC to provide the collapsing magnetic fields that induce the voltage changes in the secondary coil Ideal Effciency no loss Reality best = ~95% induction Loss due to Cu (copper) resistance (Copper loss) resistance to flow in a conductor (lg) wire diameter will reduce loss Eddy currents Laminating the core reduces eddy loss Hysteresis occurs in the core due to the loss of energy because of constant changing AC current) Improved using silicon core material A C ELECTRONS SWITCH DIRECTIONS OF FLOW RECTIFIED = DC A LOOP OF WIRE ROTATED IN A MAGNETIC FIELD = PRODUCES A CURRENT WIRE FLIPS BACK & FORTH 46

47 Electric Motor 93 Current supplied creates and electric field around the coils are moved by the magnetic field. The motion makes the motor turn Direct Current makes sure the motor only turns in one direction An electric generator produces an electrical current by rotation loops of wire through a fixed magnetic field 94 47

48 Examples of Electric Circuit Elements 95 Generatorsconvert mechanical energy to electrical energy High Voltage Increases the output voltage from autotransformer to the kvp Falling Load Type of generator used in capacitor discharge Voltage falls approx 1 kvp/mas operates at shortest time + highest ma uses series of steps (ma + t) to achieve mas Where are these used? 96 48

49 High Voltage generator 97 THAT CREATE AN ALTERNATING CURRENT ARE CALLED: AN ALTERNATOR CONVERT MECHANICAL ENERGY INTO ELECTRICITY generators 98 Function to change energy in to energy Electrical current flowing through a conductor in one direction is A battery is a source of direct current 49

50 Control Console Line monitor Autotransformer Line compensator kvp selection ma Selection Timing circuit Time selection Circuit Sections 99 High Voltage X-Ray Tube Circuit Step-up transformer Rectification circuit ma meter X-ray tube Filament Circuit Step-down transformer Focal spot selection Filaments

51 101 Circuit Diagram of Imaging System

MAGNETISM MAGNETISM. Principles of Imaging Science II (120)

MAGNETISM MAGNETISM. Principles of Imaging Science II (120) Principles of Imaging Science II (120) Magnetism & Electromagnetism MAGNETISM Magnetism is a property in nature that is present when charged particles are in motion. Any charged particle in motion creates

More information

STUDY GUIDE: ELECTRICITY AND MAGNETISM

STUDY GUIDE: ELECTRICITY AND MAGNETISM 319 S. Naperville Road Wheaton, IL 60187 www.questionsgalore.net Phone: (630) 580-5735 E-Mail: info@questionsgalore.net Fax: (630) 580-5765 STUDY GUIDE: ELECTRICITY AND MAGNETISM An atom is made of three

More information

Question Bank. 1. Electromagnetism 2. Magnetic Effects of an Electric Current 3. Electromagnetic Induction

Question Bank. 1. Electromagnetism 2. Magnetic Effects of an Electric Current 3. Electromagnetic Induction 1. Electromagnetism 2. Magnetic Effects of an Electric Current 3. Electromagnetic Induction 1. Diagram below shows a freely suspended magnetic needle. A copper wire is held parallel to the axis of magnetic

More information

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Static Electricity: Uniform electric field, electric field strength, force on a charge in an electric field, electric potential

More information

Basic Circuitry and X-ray Production. X-Ray Production. From the Beginning. What are X-Rays? Where do they come from?

Basic Circuitry and X-ray Production. X-Ray Production. From the Beginning. What are X-Rays? Where do they come from? Basic Circuitry and X-ray Production Lynn C. Sadler, MSRS, R.T.(R)(QM) President, WCEC, Inc. What are X-Rays? X-Ray Production Where do they come from? What are some characteristics of x-radiation? How

More information

2. B The magnetic properties of a material depend on its. A) shape B) atomic structure C) position D) magnetic poles

2. B The magnetic properties of a material depend on its. A) shape B) atomic structure C) position D) magnetic poles ame: Magnetic Properties 1. B What happens if you break a magnet in half? A) One half will have a north pole only and one half will have a south pole only. B) Each half will be a new magnet, with both

More information

1. The diagram below represents magnetic lines of force within a region of space.

1. The diagram below represents magnetic lines of force within a region of space. 1. The diagram below represents magnetic lines of force within a region of space. 4. In which diagram below is the magnetic flux density at point P greatest? (1) (3) (2) (4) The magnetic field is strongest

More information

And in un-magnetized state, the molecular magnets are arranged randomly.

And in un-magnetized state, the molecular magnets are arranged randomly. MAGNETISM A magnet is a piece of metal that attracts other metals. It has two poles i.e. North Pole and South Pole A pole This is a point or an area in a magnet where the attractive power seems to be concentrated.

More information

DIRECT CURRENT GENERATORS

DIRECT CURRENT GENERATORS DIRECT CURRENT GENERATORS Revision 12:50 14 Nov 05 INTRODUCTION A generator is a machine that converts mechanical energy into electrical energy by using the principle of magnetic induction. This principle

More information

GENERATORS AND MOTORS

GENERATORS AND MOTORS GENERATORS AND MOTORS A device that converts mechanical energy (energy of motion windmills, turbines, nuclear power, falling water, or tides) into electrical energy is called an electric generator. The

More information

Vocabulary Electrical Energy Negative charge Electric Field Conductor Insulator Voltage Current Circuit breaker Fuse. Chapter 17.

Vocabulary Electrical Energy Negative charge Electric Field Conductor Insulator Voltage Current Circuit breaker Fuse. Chapter 17. Introduction to Electricity Table of Contents Bellringer Write a definition for electric charge in your own words in your science journal. When do you experience electric charges most, in winter or in

More information

1. Title Electrical fundamentals II (Mechanics Repair and Maintenance)

1. Title Electrical fundamentals II (Mechanics Repair and Maintenance) 1. Title Electrical fundamentals II (Mechanics Repair and Maintenance) 2. Code EMAMBG429A 3. Range The knowledge is needed for a wide range of aircraft repair and maintenance works,e.g. applicable to aircrafts,

More information

In order to get the G.C.S.E. grade you are capable of, you must make your own revision notes using your Physics notebook.

In order to get the G.C.S.E. grade you are capable of, you must make your own revision notes using your Physics notebook. In order to get the G.C.S.E. grade you are capable of, you must make your own revision notes using your Physics notebook. When summarising notes, use different colours and draw diagrams/pictures. If you

More information

Chapter 14 Magnets and

Chapter 14 Magnets and Chapter 14 Magnets and Electromagnetism How do magnets work? What is the Earth s magnetic field? Is the magnetic force similar to the electrostatic force? Magnets and the Magnetic Force! We are generally

More information

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other. PS-6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,

More information

Electrical discharge in air e.g. lightning

Electrical discharge in air e.g. lightning Static Electricity electron transfer causes static electricity results from an imbalance of charges can occur by induction, friction, and contact You need to describe the direction of motion of charges

More information

MAGNETIC EFFECTS OF ELECTRIC CURRENT

MAGNETIC EFFECTS OF ELECTRIC CURRENT CHAPTER 13 MAGNETIC EFFECT OF ELECTRIC CURRENT In this chapter, we will study the effects of electric current : 1. Hans Christian Oersted (1777-1851) Oersted showed that electricity and magnetism are related

More information

Physics 12 Study Guide: Electromagnetism Magnetic Forces & Induction. Text References. 5 th Ed. Giancolli Pg

Physics 12 Study Guide: Electromagnetism Magnetic Forces & Induction. Text References. 5 th Ed. Giancolli Pg Objectives: Text References 5 th Ed. Giancolli Pg. 588-96 ELECTROMAGNETISM MAGNETIC FORCE AND FIELDS state the rules of magnetic interaction determine the direction of magnetic field lines use the right

More information

Chapter 14. Transformers ISU EE. C.Y. Lee

Chapter 14. Transformers ISU EE. C.Y. Lee Chapter 14 Transformers Objectives Explain mutual inductance Describe how a transformer is constructed and how it works Explain how a step-up and -down transformer works Discuss the effect of a resistive

More information

DC GENERATOR THEORY. LIST the three conditions necessary to induce a voltage into a conductor.

DC GENERATOR THEORY. LIST the three conditions necessary to induce a voltage into a conductor. DC Generators DC generators are widely used to produce a DC voltage. The amount of voltage produced depends on a variety of factors. EO 1.5 LIST the three conditions necessary to induce a voltage into

More information

TRANSFORMERS INTRODUCTION

TRANSFORMERS INTRODUCTION Tyco Electronics Corporation Crompton Instruments 1610 Cobb International Parkway, Unit #4 Kennesaw, GA 30152 Tel. 770-425-8903 Fax. 770-423-7194 TRANSFORMERS INTRODUCTION A transformer is a device that

More information

Circuits and Electricity

Circuits and Electricity Have you ever thought about how much we depend on electricity? Electricity is a form of energy that runs computers, appliances, and radios. Electricity lights our homes, schools, and office buildings.

More information

X-ray Imaging System. X-Ray Circuit. Principles of Imaging Science II (RAD 120) X-ray Imaging System Circuitry

X-ray Imaging System. X-Ray Circuit. Principles of Imaging Science II (RAD 120) X-ray Imaging System Circuitry Principles of Imaging Science II (RAD 120) X-ray Imaging System Circuitry X-ray Imaging System Operating console Set x-ray tube current (quantity) and voltage (quality) Controls line compensation, kvp,

More information

Two kinds of electrical charges

Two kinds of electrical charges ELECTRICITY NOTES Two kinds of electrical charges Positive charge Negative charge Electrons are negatively charged Protons are positively charged The forces from positive charges are canceled by forces

More information

1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE

1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE Name Date STUDY GUIDE CHAPTER 5 ELECTRICITY AND MAGNETISM 1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE Scientists now know that an atom is composed of even smaller particles of matter:

More information

MAGNETISM AND ELECTRICITY

MAGNETISM AND ELECTRICITY MAGNETISM AND ELECTRICITY Magnetism is a natural phenomenon first documented by the Greeks who observed that a naturally occurring substance, magnetite would attract pieces of iron. Later on, the Chinese

More information

Chapter 14 Magnets and Electromagnetism

Chapter 14 Magnets and Electromagnetism Chapter 14 Magnets and Electromagnetism Magnets and Electromagnetism In the 19 th century experiments were done that showed that magnetic and electric effects were just different aspect of one fundamental

More information

Magnetism and Electromagnetic Induction Generators and Transformers

Magnetism and Electromagnetic Induction Generators and Transformers PHSC 101 Lab Magnetism and Electromagnetic Induction Generators and Transformers Objectives: - Explore a magnetic field. - Demonstrate electromagnetic induction with a magnet and a coil of wire. - Demonstrate

More information

Table of Contents 1. Introduction 2. Electrical Fundamentals Electron Theory Matter 4 MOLECULE

Table of Contents 1. Introduction 2. Electrical Fundamentals Electron Theory Matter 4 MOLECULE Table of Contents 1. Introduction 3 2. Electrical Fundamentals 4 Electron Theory 4 Matter 4 MOLECULE 5 The atom 6 Atom construction 7 Electrical charges 11 Balanced atoms 12 Ions 13 Electron orbits 15

More information

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME - D.C. CIRCUITS Be able to use circuit theory to determine voltage, current and resistance in direct

More information

Science AS90191 Describe Aspects of Physics.

Science AS90191 Describe Aspects of Physics. Circuits and components Science AS90191 Describe Aspects of Physics. An electric current is the movement of electrons (negatively charged particles). A circuit is made up of components connected together

More information

physics 112N electromagnetic induction

physics 112N electromagnetic induction physics 112N electromagnetic induction experimental basis of induction! seems we can induce a current in a loop with a changing magnetic field physics 112N 2 magnetic flux! useful to define a quantity

More information

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory Introduction to Electricity & Magnetism Dr Lisa Jardine-Wright Cavendish Laboratory Examples of uses of electricity Christmas lights Cars Electronic devices Human body Electricity? Electricity is the presence

More information

Magnetism Basics. Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment. Net Effect = Zero!

Magnetism Basics. Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment. Net Effect = Zero! Magnetism Basics Source: electric currents Magnetic Domains: atomic regions of aligned magnetic poles Random Alignment Ferromagnetic Alignment Net Effect = Zero! Net Effect = Additive! Bipolar: all magnets

More information

Draw a ring around the correct answer to complete the following sentences. power supply. (1)

Draw a ring around the correct answer to complete the following sentences. power supply. (1) Q. The diagram shows a transformer made by a student. The student has designed the transformer to make a 6 V light bulb work using a 2 V power supply. (a) Draw a ring around the correct answer to complete

More information

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3. OUTCOME 3 - MAGNETISM and INDUCTION

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3. OUTCOME 3 - MAGNETISM and INDUCTION EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 3 - MAGNETISM and INDUCTION 3 Understand the principles and properties of magnetism Magnetic field:

More information

Field Lines Domains. Horseshoe Ring/Disc

Field Lines Domains. Horseshoe Ring/Disc Magnets Info Lab (25 pts) 1. nickel, cobalt, iron 2.Iron, Nickel,and Cobalt have an unmatched electron spinning either UP or DOWN. The result is an atom with a net spin and thus a magnetic field. 3, Field

More information

TOPIC 4 ELECTRIC CIRCUITS

TOPIC 4 ELECTRIC CIRCUITS IGCSE Physics 0625 notes Topic 4: Electric Circuits 1 TOPIC 4 ELECTRIC CIRCUITS ELECTRIC CURRENT (I): Current (I) is defined as the rate of flow of electric charge (Q) in an electric conductor. The unit

More information

R Ch 36 Magnetism pg 1. Text Qs pg 575 RQ 1, 2, 4, 5, 7-9,12,13,19

R Ch 36 Magnetism pg 1. Text Qs pg 575 RQ 1, 2, 4, 5, 7-9,12,13,19 R Ch 36 Magnetism pg 1 Text Qs pg 575 RQ 1, 2, 4, 5, 7-9,12,13,19 R Ch 36 Magnetism pg 2 Magnets are essential for modern life, they are used in generators, motors, lights etc. Originally called loadstones

More information

6. ELECTROMAGNETIC INDUCTION

6. ELECTROMAGNETIC INDUCTION 6. ELECTROMAGNETIC INDUCTION Questions with answers 1. Name the phenomena in which a current induced in coil due to change in magnetic flux linked with it. Answer: Electromagnetic Induction 2. Define electromagnetic

More information

Copyright 2014 Edmentum - All rights reserved.

Copyright 2014 Edmentum - All rights reserved. Copyright 2014 Edmentum - All rights reserved. Science Physics Electromagnetic Blizzard Bag 2014-2015 1. Two coils of insulated wire are placed side by side, as shown in the illustration. The blue lines

More information

1) 10. V 2) 20. V 3) 110 V 4) 220 V

1) 10. V 2) 20. V 3) 110 V 4) 220 V 1. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R 1, and a variable resistor, R 2. 3. What is the total resistance of the circuit 1) 6.6 Ω 2) 10

More information

National 4 Summary Notes

National 4 Summary Notes North Berwick High School Department of Physics National 4 Summary Notes Unit 3 Electricity and Energy Physics N4 Unit 1: Pupil Notes Page 1 of 22 Section 1: Generation of Electricity What is electricity?

More information

Magnets and the Magnetic Force

Magnets and the Magnetic Force Magnets and the Magnetic Force We are generally more familiar with magnetic forces than with electrostatic forces. Like the gravitational force and the electrostatic force, this force acts even when the

More information

Objectives for the standardized exam

Objectives for the standardized exam III. ELECTRICITY AND MAGNETISM A. Electrostatics 1. Charge and Coulomb s Law a) Students should understand the concept of electric charge, so they can: (1) Describe the types of charge and the attraction

More information

Aircraft Electrical System

Aircraft Electrical System Chapter 9 Aircraft Electrical System Introduction The satisfactory performance of any modern aircraft depends to a very great degree on the continuing reliability of electrical systems and subsystems.

More information

Name: Date: Regents Physics Mr. Morgante UNIT 4B Magnetism

Name: Date: Regents Physics Mr. Morgante UNIT 4B Magnetism Name: Regents Physics Date: Mr. Morgante UNIT 4B Magnetism Magnetism -Magnetic Force exists b/w charges in motion. -Similar to electric fields, an X stands for a magnetic field line going into the page,

More information

s_5xut Page 1 Physics Samples

s_5xut Page 1 Physics Samples Physics Samples E&M Unit 1. Two metal spheres having charges of +4.0 x 10 6 coulomb and +2.0 x 10 5 coulomb, respectively, are brought into contact and then separated. After separation, the charge on each

More information

What is the direction of a compass needle placed at point A?

What is the direction of a compass needle placed at point A? SAMPLE QUIZ: COVERAGE OHM S LAW CIRCUIT ANALYSIS RESISTANCE ELECTRICAL POWER MAGNETISM AND ELECTROMAGNETISM MAGNETISM: 1. In order to produce a magnetic field, an electric charge must be 1. stationary

More information

Ohm s Law & Series Circuit

Ohm s Law & Series Circuit Open the TI-Nspire document Ohms_Law_&_Series_Circuit.tns. We all use and rely on electric circuits every day by flipping a switch, turning up the volume, or operating a computer or calculator. Even the

More information

Chap 21. Electromagnetic Induction

Chap 21. Electromagnetic Induction Chap 21. Electromagnetic Induction Sec. 1 - Magnetic field Magnetic fields are produced by electric currents: They can be macroscopic currents in wires. They can be microscopic currents ex: with electrons

More information

Reading Quiz. 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called?

Reading Quiz. 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? Reading Quiz 1. Currents circulate in a piece of metal that is pulled through a magnetic field. What are these currents called? A. Induced currents B. Displacement currents C. Faraday s currents D. Eddy

More information

Chapter 22: Electric motors and electromagnetic induction

Chapter 22: Electric motors and electromagnetic induction Chapter 22: Electric motors and electromagnetic induction The motor effect movement from electricity When a current is passed through a wire placed in a magnetic field a force is produced which acts on

More information

Back to the Basics Current Transformer (CT) Testing

Back to the Basics Current Transformer (CT) Testing Back to the Basics Current Transformer (CT) Testing As test equipment becomes more sophisticated with better features and accuracy, we risk turning our field personnel into test set operators instead of

More information

2. A conductor of length 2m moves at 4m/s at 30 to a uniform magnetic field of 0.1T. Which one of the following gives the e.m.f. generated?

2. A conductor of length 2m moves at 4m/s at 30 to a uniform magnetic field of 0.1T. Which one of the following gives the e.m.f. generated? Extra Questions - 2 1. A straight length of wire moves through a uniform magnetic field. The e.m.f. produced across the ends of the wire will be maximum if it moves: a) along the lines of magnetic flux

More information

How do you measure voltage and current in electric circuits? Materials

How do you measure voltage and current in electric circuits? Materials 20A Electricity How do you measure voltage and current in electric circuits? Electricity Investigation 20A We use electricity every day, nearly every minute! In this Investigation you will build circuits

More information

Circuits with inductors and alternating currents. Chapter 20 #45, 46, 47, 49

Circuits with inductors and alternating currents. Chapter 20 #45, 46, 47, 49 Circuits with inductors and alternating currents Chapter 20 #45, 46, 47, 49 RL circuits Ch. 20 (last section) Symbol for inductor looks like a spring. An inductor is a circuit element that has a large

More information

Electric Currents. Electric Potential Energy 11/23/16. Topic 5.1 Electric potential difference, current and resistance

Electric Currents. Electric Potential Energy 11/23/16. Topic 5.1 Electric potential difference, current and resistance Electric Currents Topic 5.1 Electric potential difference, current and resistance Electric Potential Energy l If you want to move a charge closer to a charged sphere you have to push against the repulsive

More information

101 BASICS SERIES LEARNING MODULE 2: FUNDAMENTALS OF ELECTRICITY. Cutler-Hammer

101 BASICS SERIES LEARNING MODULE 2: FUNDAMENTALS OF ELECTRICITY. Cutler-Hammer 101 BASICS SERIES LEARNING MODULE 2: FUNDAMENTALS OF ELECTRICITY Cutler-Hammer WELCOME Welcome to Module 2, Fundamentals of Electricity. This module will cover the fundamentals of electricity in a practical

More information

Multiple Choice Questions for Physics 1 BA113 Chapter 23 Electric Fields

Multiple Choice Questions for Physics 1 BA113 Chapter 23 Electric Fields Multiple Choice Questions for Physics 1 BA113 Chapter 23 Electric Fields 63 When a positive charge q is placed in the field created by two other charges Q 1 and Q 2, each a distance r away from q, the

More information

Electrical Machines II. Week 1: Construction and theory of operation of single phase transformer

Electrical Machines II. Week 1: Construction and theory of operation of single phase transformer Electrical Machines II Week 1: Construction and theory of operation of single phase transformer Transformers Overview A transformer changes ac electric power at one frequency and voltage level to ac electric

More information

Chapter 11. Inductors. Objectives

Chapter 11. Inductors. Objectives Chapter 11 Inductors Objectives Describe the basic structure and characteristics of an inductor Discuss various types of inductors Analyze series inductors Analyze parallel inductors Analyze inductive

More information

Material World: Electricity

Material World: Electricity 17. Coulomb s Law The force, F, between two objects with charge q 1 and q 2, is given by: k q 1 q F - 2, where r = distance between the two charges in meters 2 r k = Coulomb's constant = 9 X 10 9 m 2 /C

More information

BASANT S SCIENCE ACADEMY STUDY MATERIAL MAGNETIC EFFECT OF CURRENT

BASANT S SCIENCE ACADEMY STUDY MATERIAL MAGNETIC EFFECT OF CURRENT BASANT S SCIENCE ACADEMY Why does a compass needle get deflected when brought near a bar magnet? A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact

More information

Lecture PowerPoints. Chapter 19 Physics: Principles with Applications, 7th edition Giancoli

Lecture PowerPoints. Chapter 19 Physics: Principles with Applications, 7th edition Giancoli Lecture PowerPoints Chapter 19 Physics: Principles with Applications, 7th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching

More information

Chapter 7. Magnetism and Electromagnetism ISU EE. C.Y. Lee

Chapter 7. Magnetism and Electromagnetism ISU EE. C.Y. Lee Chapter 7 Magnetism and Electromagnetism Objectives Explain the principles of the magnetic field Explain the principles of electromagnetism Describe the principle of operation for several types of electromagnetic

More information

The current that flows is determined by the potential difference across the conductor and the resistance of the conductor (Ohm s law): V = IR P = VI

The current that flows is determined by the potential difference across the conductor and the resistance of the conductor (Ohm s law): V = IR P = VI PHYS1000 DC electric circuits 1 Electric circuits Electric current Charge can move freely in a conductor if an electric field is present; the moving charge is an electric current (SI unit is the ampere

More information

ELECTROMAGNETISM I. CAUSES OF MAGNETISM

ELECTROMAGNETISM I. CAUSES OF MAGNETISM I. CAUSES OF MAGNETISM ELECTROMAGNETISM 1. Moving electric fields (moving charges) cause magnetism. Yes, that current moving in electric circuits cause a magnetic field. More later! 2. Elementary nature

More information

2. TRANSFORMERS. The main learning objectives for this chapter are listed below. Use equivalent circuits to determine voltages and currents.

2. TRANSFORMERS. The main learning objectives for this chapter are listed below. Use equivalent circuits to determine voltages and currents. . TRANSFORMERS Transformers are commonly used in applications which require the conversion of AC voltage from one voltage level to another. There are two broad categories of transformers: electronic transformers,

More information

ELECTRICITYt. Electromagnetism

ELECTRICITYt. Electromagnetism ELECTRICITYt Electromagnetism Subject area : Physics Topic focus : magnetic properties, magnetic field, the Earth s magnetic field, magnetic field of an electric wire. Learning Aims : Polarity of bar magnets

More information

SECME. Generator Building Competition

SECME. Generator Building Competition SECME Generator Building Competition TOPICS Purpose & Necessity Competition Rules & Scoring Basic Theory of Electrical Generators Generator Building Instructions 2 PURPOSE & NECESSITY 3 Purpose & Necessity

More information

Chapter 17 Study Questions Name: Class:

Chapter 17 Study Questions Name: Class: Chapter 17 Study Questions Name: Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. If two charges repel each other, the two charges

More information

AC Generators. Basic Generator

AC Generators. Basic Generator AC Generators Basic Generator A basic generator consists of a magnetic field, an armature, slip rings, brushes and a resistive load. The magnetic field is usually an electromagnet. An armature is any number

More information

Line Reactors and AC Drives

Line Reactors and AC Drives Line Reactors and AC Drives Rockwell Automation Mequon Wisconsin Quite often, line and load reactors are installed on AC drives without a solid understanding of why or what the positive and negative consequences

More information

AP Physics C Chapter 23 Notes Yockers Faraday s Law, Inductance, and Maxwell s Equations

AP Physics C Chapter 23 Notes Yockers Faraday s Law, Inductance, and Maxwell s Equations AP Physics C Chapter 3 Notes Yockers Faraday s aw, Inductance, and Maxwell s Equations Faraday s aw of Induction - induced current a metal wire moved in a uniform magnetic field - the charges (electrons)

More information

Draft Unit 6: Electricity and Magnetism Key Ideas:

Draft Unit 6: Electricity and Magnetism Key Ideas: Unit 6: Electricity and Magnetism Key Ideas: 6.1 Observe, describe, and investigate the evidence of energy transfer in electrical circuits. 6.2 Construct and diagram an electrical circuit 6.3 Identify

More information

Special Instruments UNIT. Learning Objectives. 4.1 Introduction. 4.2 Power Factor Meter

Special Instruments UNIT. Learning Objectives. 4.1 Introduction. 4.2 Power Factor Meter UNIT 4 Special Instruments Learning Objectives Necessity of Special instruments Construction, working, applications of powerfactor meter, frequency meter, synchronoscope, meggar, tongue tester, multi-meter.

More information

Chapter 4. Magnetic Materials and Circuits

Chapter 4. Magnetic Materials and Circuits Chapter 4 Magnetic Materials and Circuits Objectives List six characteristics of magnetic field. Understand the right-hand rule for current and magnetic fluxes. Define magnetic flux, flux density, magnetomotive

More information

Chapter 5 TRANSFORMERS

Chapter 5 TRANSFORMERS Chapter 5 TRANSFORMERS Objective Understand the transformer nameplate Describe the basic construction features of a transformer. Explain the relationship between voltage, current, impedance, and power

More information

Objectives. Capacitors 262 CHAPTER 5 ENERGY

Objectives. Capacitors 262 CHAPTER 5 ENERGY Objectives Describe a capacitor. Explain how a capacitor stores energy. Define capacitance. Calculate the electrical energy stored in a capacitor. Describe an inductor. Explain how an inductor stores energy.

More information

Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 12 Solutions

Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 12 Solutions Concept Check (top) Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 1 Solutions Student Book page 583 Concept Check (bottom) The north-seeking needle of a compass is attracted to what is called

More information

Transformers. What is a transformer?

Transformers. What is a transformer? Transformers What is a transformer? A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors the transformer's coils. A physical and

More information

Electricity and Water Analogy

Electricity and Water Analogy [ Assignment View ] [ Eðlisfræði 2, vor 2007 25. Current, Resistance, and Electromagnetic Force Assignment is due at 2:00am on Wednesday, February 14, 2007 Credit for problems submitted late will decrease

More information

Current and resistance

Current and resistance Current and resistance Electrical resistance Voltage can be thought of as the pressure pushing charges along a conductor, while the electrical resistance of a conductor is a measure of how difficult it

More information

AC Motors Synchronous and Asynchronous

AC Motors Synchronous and Asynchronous EEE 2015 ELECTRICS Electromechanical systems For energy conversion between electrical and mechanical forms, electromechanical devices are developed, which can be divided into three categories: 1. Transducers

More information

Making a Shaker (or Forever) Flashlight. Grade 9 Activity Plan

Making a Shaker (or Forever) Flashlight. Grade 9 Activity Plan Making a Shaker (or Forever) Flashlight Grade 9 Activity Plan 1 Making a Shaker (or Forever) Flashlight Objectives: 1. To apply knowledge of electromagnetic induction to generate power for the flashlight.

More information

Section 5. Electric Power: Load Limit. What Do You See? What Do You Think? Investigate. Learning Outcomes

Section 5. Electric Power: Load Limit. What Do You See? What Do You Think? Investigate. Learning Outcomes Section 5 Electric Power: Load Limit What Do You See? Learning Outcomes In this section, you will Define power, insulator, and conductor. Use the equation for power, P = IV. Calculate the power limit of

More information

Circuits Review KEY Interpreting Diagrams Use the diagram below to answer the following questions.

Circuits Review KEY Interpreting Diagrams Use the diagram below to answer the following questions. Circuits Review KEY Interpreting Diagrams Use the diagram below to answer the following questions. 1. Look at the arrows which indicate the direction of the flow of electrons. Label the negative and the

More information

Induced voltages and Inductance Faraday s Law

Induced voltages and Inductance Faraday s Law Induced voltages and Inductance Faraday s Law concept #1, 4, 5, 8, 13 Problem # 1, 3, 4, 5, 6, 9, 10, 13, 15, 24, 23, 25, 31, 32a, 34, 37, 41, 43, 51, 61 Last chapter we saw that a current produces a magnetic

More information

ElectroMagnetic Induction. AP Physics B

ElectroMagnetic Induction. AP Physics B ElectroMagnetic Induction AP Physics B What is E/M Induction? Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a complete circuit, a current. Michael Faraday

More information

Reading Comprehension Skills Preview the Book Compare and Contrast How to Read Charts Main Idea and Details

Reading Comprehension Skills Preview the Book Compare and Contrast How to Read Charts Main Idea and Details TM Red Edition Grade 3 4 reading level Purple Edition Grade 4 5 reading level Objectives Understand that electric charge is a property of matter. Compare static electricity and current electricity. Describe

More information

SERIES AND PARALLEL CIRCUITS

SERIES AND PARALLEL CIRCUITS SERIES AND PARALLEL CIRCUITS Circuits Provides a path for electricity to travel Similar to water pipes in your house Because of the voltage of an outlet, electrons will travel through the circuit Electrons

More information

ALTERNATING CURRENTS

ALTERNATING CURRENTS ALTERNATING CURRENTS VERY SHORT ANSWER QUESTIONS Q-1. What is the SI unit of? Q-2. What is the average value of alternating emf over one cycle? Q-3. Does capacitor allow ac to pass through it? Q-4. What

More information

Ch.20 Induced voltages and Inductance Faraday s Law

Ch.20 Induced voltages and Inductance Faraday s Law Ch.20 Induced voltages and Inductance Faraday s Law Last chapter we saw that a current produces a magnetic field. In 1831 experiments by Michael Faraday and Joseph Henry showed that a changing magnetic

More information

Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws

Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws Physics 182 Spring 2013 Experiment #6 1 Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws 1 Purpose Our purpose is to explore and validate Kirchhoff s laws as a way to better understanding

More information

Tuesday, 9 August 2016

Tuesday, 9 August 2016 Tuesday, 9 August 2016 Conceptual Problem 34.10 a When the switch on the left is closed, which direction does current flow in the meter on the right: 1. Right to left 2. Left to right 3. There is no induced

More information

Chapter 13 Electric Circuits

Chapter 13 Electric Circuits Chapter 13 Electric Circuits What is Electric Current? How does it resemble the flow of water in a pipe? Can you get a flashlight bulb to light, with a battery and a single wire? Electric Circuits and

More information

Unit I Measurement of voltage and Current

Unit I Measurement of voltage and Current MARIA COLLEGE OF ENGINEERING AND TECHNOLOGY, ATTOOR DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING MEASUREMENTS AND INSTRUMENTATION 2 MARKS QUESTIONS & ANSWERS Unit I Measurement of voltage and

More information

7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A

7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A 1. Compared to the number of free electrons in a conductor, the number of free electrons in an insulator of the same volume is less the same greater 2. Most metals are good electrical conductors because

More information

Lecture 37. Power. Circuits. Parallel and Series Resistances. Cutnell+Johnson: Circuits

Lecture 37. Power. Circuits. Parallel and Series Resistances. Cutnell+Johnson: Circuits Lecture 37 Power Circuits Parallel and Series Resistances Cutnell+Johnson: 0.4-0.8 Circuits Now that we know about voltages, currents and resistance, we can talk about circuits. A circuit is simply a closed

More information