Background: Electric resistance, R, is defined by:


 Elfreda Freeman
 1 years ago
 Views:
Transcription
1 RESISTANCE & OHM S LAW (PART I and II)  8 Objectives: To understand the relationship between applied voltage and current in a resistor and to verify Ohm s Law. To understand the relationship between applied voltage and current in a Light Emitting Diode (LED). To understand simple parallel and series circuits and to use this understanding to determine the circuit connections of a hidden black box resistor network. To test the connection between resistance, current, voltage, and power dissipation. Equipment: Digital multimeters(2 per group)(dmm for short), variable power supply (prefer 018 Volt), snaponcircuitboard, 6V lamps, resistors, LED's of different colors. A multimeter is a device that can be used as a voltmeter, an ammeter, or an ohmmeter. Background: Electric resistance, R, is defined by: R = V / I, (1) where V is the potential difference (or voltage drop) across the resistor and I is the current through it. The unit of resistance is the Ohm. ( = Volt/Ampere = V/A). If R = 0 in a circuit, it is called a "shorted" circuit; if R =, it is called an open circuit. The product P = I V is the power dissipated in the resistor (of course P = I V = I 2 R = V 2 / R ). Ohm's Law: For many materials resistance R is a constant, independent of I and V. The linear relationship between V and I, V = I R is called Ohm s Law. Materials obeying Ohm s Law are said to be "Ohmic" materials. (Simple light bulbs do NOT satisfy this Law, manufactured resistors do. An LED does NOT obey Ohm s Law. ) Equivalent Resistance: When several resistors are connected together, they can also be replaced with a single resistor that will have the same potential drop and draw the same total current as the combination of resistors. This resistance is called the equivalent resistance R eq of the circuit. Resistors in Series: Figure 1. Series Connections When the same current flows through each of a number of resistors, they are said to be in series. The equivalent resistance R eq for resistors connected in series is Ohm 1
2 R eq R i (2) i Note that here R eq is larger than any of the individual resistances. Resistors in Parallel Figure 2. Parallel Connections When the same potential difference appears across each of a number of resistors, they are said to be in parallel. The equivalent resistance R eq for resistors connected in parallel is 1 1 (3) Req R i i Note that here Req is smaller than any of the individual resistances. Electrical Measurements: A voltmeter is a device to measure the potential drop across a circuit or across part of a circuit. A voltmeter has a very large resistance so that the current through it is negligible, and it can be assumed that the potential drop across the resistor in Fig. 3a is the same whether or not the voltmeter is attached. A voltmeter is always connected in parallel with the circuit element whose potential difference is to be measured. An ammeter is a device to measure the current through a circuit element. It has a very small resistance so that the potential drop across is negligible, and it can be assumed that the current through the resistor in Fig. 3b is the same whether or not the ammeter is inserted in the circuit. An ammeter is always connected in series with circuit element whose current is to be measured. If you do not connect the ammeter the correct way, you can severely damage the device. Ohm 2
3 Figure 3a Voltmeter Connection Figure 3b Ammeter Connection An ohmmeter is a device that measures resistance. It is connected in parallel across the resistance to measured. You should NOT measure the resistance of a resistor that is still part of a circuit. You will probably destroy the ohmmeter, certainly you will measure the wrong resistance. In practice first disconnect all leads of the resistor to be measured, so no electric current runs through the resistor, except for the current supplied by the battery inside the ohmmeter itself. If you do not connect the Ohmmeter the right way, you can severely damage the device. PART I Diagnostic Phase: You should always make a schematic drawing on paper before building any circuit! Make a simple circuit on the snaponcircuitboard, consisting of three 6V lamps in series and a variable power supply. Start at low power output and slowly turn up the power until the lamps start to glow. Switch the multimeter to the Voltage Mode and measure the total voltage difference over the entire circuit, then the voltage drop over each lamp. Interupt the circuit and reconnect but insert also the leads of the multimeter, switch the multimeter to the Ampere Mode. You now measure the electric current flowing out of the power supply, through the circuit and through each lamp. Since by now you have become an expert in electric circuits, put the lamps back in the box and let s start with the serious stuff. Activity 1: Ohms' Law. You will measure the resistance of an unknown resistor in three ways and verify that Ohm s Law applies: A. (Easy way): Use an ohmmeter to measure the resistance. See if the measured resistance remains the same if the leads to the ohmmeter are reversed. B. (Fancy but more realistic way): Connect an ammeter in series with the resistor and a voltmeter in parallel with it as shown below in figure 4, i.e. use two multimeters in Ohm 3
4 the circuit. Use a variable output power supply to drive the circuit. As the output voltage is increased, measure I and V for a dozen values of V. To determine the resistance R and verify the linear relation of Ohm s Law, use Graphical Analysis and plot I versus V for a number of different voltage settings, make a linear fit to the data and obtain the correlation coefficient. From the slope you can obtain the resistance R. How? V A + Figure 4. Measuring voltage and current simultaneously of an Ohmic resistor. C. (Way for dummies): Read the commercial color coding of the resistor. Does it agree with A and B? Activity 2: Light emitting diode(led)  NONOhmic behavior. As an example of a device which does not obey Ohm's law, you will investigate an LED (Light Emitting Diode). For a NONOhmic device there is no easy way to measure its resistance with an ohmmeter. Actually its resistance is not fixed, but an I versus V plot clarifies its response to an applied voltage. A. Make a circuit by connecting a 100 ~ 200 ohm resistor in series with an LED. See figure 5. The resistor is put in to prevent burning out the LED. Connect a voltmeter across the resistor and measure the voltage across the resistor for several values of the supply voltage setting. (Keep the Voltage to be less than 5V and the current below 10 ma to prevent damage to the LED). Ohm 4
5 Since V power source = V ps is known, and V resistor + V LED = V ps, an alternative is to measure V LED directly. To measure the current I you can add an ammeter to the circuit as you did in Activity 1, or instead you can calculate each time the electric current I from the reading V resistor of the Voltmeter and the known value R of the resistor (V = I R for an Ohmic resistor). At what values of the current does the LED emit light, and at which values does it not emit light? Now reverse the leads from the power supply and repeat the measurement of current in the same range of voltage setting. Compare your observations with what you would expect for Ohmic behavior. B. Try another diode with a different color. ( Different materials have different electron energy gaps. As the electrons jump the gap this leads to emission of light of different colors. Available are LED s which emit red, green, yellow, or blue light.) v oltmeter resistor LED v oltage supply Figure 5. Measuring voltage and current for nonohmic device. PART II Activity 3: Back to Ohmic resistors. For this activity you will use three resistors  two with the same resistance and one with a different resistance (10 k 10 k and 20 k for example). A. Determine all possible ways you can connect the resistors in series and/or parallel to give different equivalent resistances. Draw a diagram of each of these combinations, and calculate the theoretical equivalent resistance. B. Set up two of the circuits in A on the breadboard and measure the actual equivalent resistance with a ohmmeter and compare with your calculation. C. Calculate the power dissipated by each resistor in the two circuits in B if a 12 V power supply is connected across the circuit. Ohm 5
6 Appendix: Resistors are coded with 4 colored stripes around the body of the resistor that allow easy determination of the resistance. The code for the first 3 colored bands is given below: RESISTOR COLOR CODES COLOR 1ST DIGIT 2ND DIGIT MULTIPLIER Silver Gold Black Brown Red Orange Yellow Green Blue Violet Gray White The 4th colored band gives the "tolerance," i. e., the uncertainty in the marked resistance, as follows: gold: 5% silver: 10% no color: 20% Example: Figure 8. A Color Coded Resistor Helpful Hint: Most people who get incorrect results in this experiment do so because they fail to use the multimeter correctly. Make sure the multimeter is reading ohms AND that the gain or sensitivity is at the maximum number of significant digits for that resistance. Change the sensitivity by trial and error the maximum number of digits. Ohm 6
7 RESISTANCE & OHM S LAW (preliminary questions) Names: Section: You have three identical light bulbs each with a constant (assume Ohmic) resistance of 150. Suppose you connect the circuits to a 12 V battery. a.) Draw diagrams showing all the 4 possible ways they can be connected in series or parallel or in a combination of series and parallel. b.) You can identify brightness with Power (= Energy per second). How is the current I passing through each bulb related to the brightness? c.) Which of the circuits is the brightest, and which circuit is the dimmest? Ohm 7
8 Report  RESISTANCE & OHM S LAW (Part I) Name: Section: Partners: Date: Part I Diagnostic Phase, building a circuit: On the snaponcircuitboard construct a simple circuit of three 6V lightbulbs in series and connections to the variable power supply. Starting at low voltage, slowly turn up the voltage output of the power supply until the lamps start to glow. DO NOT GO HIGHER. Put the multimeter on DC Volts (V=, not V~) and measure the total voltage over the three lamps. [WITHIN THE DCVOLT RANGES ON THE MULTIMETER ALWAYS START WITH THE HIGHEST RANGE. If the reading is too low, turn to a lower range.] Now measure the voltage drop over each lamp. Put the multimeter on DC Ampere [again start at highest range] and measure the electric current that flows out of the power supply. (In order to do this step, you have to interrupt the circuit and insert the leads of the Ampmeter). If you do not follow this step carefully, you may damage the multimeter. Measure the current in between lamp 1 and lamp 2. Make a schematic drawing of the circuit, showing lamps, power supply and connecting wires. Mark the values of your measured voltages and currents in the circuit. Indicate direction of the current and + and for voltages. Ohm 8
9 Activity 1: Determine an unknown resistance in three ways (a, b, c) and verifying Ohm s Law. a.) Direct from Ohmmeter: reading = R unknown = Note that the resistor R unknown at this point should be freestanding (not part of any circuit). If you do not disconnect the resistor from the circuit, you may damage the multimeter. b.) From I versus V graph: Draw a circuit of the unknown resistor and the power supply, and indicate where in this circuit you measure the current I and the voltage V. Construct the circuit you have just drawn. Include leads to the power supply, leads to the voltmeter, and leads to the current meter. In this circuit vary the output voltage of the power supply and measure voltage and current at least for 12 settings in the range 0 18 V, (measure the voltage V over R and the current I passing through R). V (V) I(mA) V (V) I(mA) V (V) I(mA) V (V) I(mA) Make a graphical representation ( V on horizontal axis, I on vertical axis ) and include the graph with the report. (Don t forget labeling the axes and give it an appropriate title). Ohm 9
10 How is the slope of a linear fit related to the resistance R? Do not forget the units. R unknown = Verify Ohmic behavior by checking if your data agree with Ohm s Law, i.e. how good is your linear fit. correlation =. c.) Resistance determined for the same unknown resistor from the color code: R unknown = ± The manufacturer s claimed tolerance is indicated by the last color band on the right. Is your measured value in the tolerance range given by the manufacturer? Ohm 10
11 Activity 2: Light emitting diode (LED)  nonohmic behavior. [Do not allow more than 10 ma of current to flow through the LED to prevent damage.] A. Draw a circuit connecting a red LED in series with a 100 ~ 200 Ohm resistor connected to the power source. Where in this circuit do you measure voltage V over the LED and where do you measure current I passing through the LED? (For simplicity, measure the voltage directly over the LED.) B. Construct this circuit on the snaponcircuitboard. Measure I and V LED for a range 0 5 V allowing only small increments in the current I and record in the table below. C. The value of current I when the red LED first lights up: ma D. The value of the voltage over the red LED, V LED when the LED first lights up: V Describe your observations that show I versus V behavior of the LED. Include a table of I versus V LED for the range 0 5 V for again at least 12 settings. Since current I may change rapidly, aim at steps of at most 0.5 ma for the current. Keep the current below 5.0 ma. Remember Imax = 10 ma!!! LED s are delicate and only allow low currents. In addition, show several data points (steps of about 0.2 ma) just above the voltage where the LED starts lighting up and the current is still small. What happens if you reverse the leads of the LED? (rotate the LED 180 degrees, leave everything else unchanged). Ohm 11
12 V LED (V) I (ma) V LED (V) I (ma) V LED (V) I (ma) V LED (V) I (ma) Make a graph showing I versus V LED (current vertical, voltage horizontal). Include also the data for reversed leads in the same graph by extending the voltage axis to include also negative values. (Reversed is equivalent to negative voltage.) Include the graph in the final report. How is this nonohmic behavior different from Ohmic behavior? Comment on the several aspects of the behaviour shown in the graph. Ohm 12
13 Report  RESISTANCE & OHM S LAW (Part II) Name: Section: Partners: Date: PART II Activity 3: Resistance combinations. Use the ohmmeter to measure the resistances of the three resistors you will use. Choose two of the resistances to be as closely the same value as possible and the other resistance to be at least twice as big. R 1 = R 2 = R 3 = A. Draw diagrams of all possible ways that you can connect these three resistances in series and/or parallel to give different equivalent resistances. For each diagram calculate the theoretical equivalent resistance (show your work) B. Set up two of the circuits and measure the actual value with an ohmmeter. C. Calculate the power dissipated by each resistor in the two circuits in B if a 12 V battery is connected across the circuit. [Not all entries are needed to be filled.] Circuit 1 R eq (theoretical) = R eq (experimental) = Power dissipated = diagram work Circuit 2 R eq (theoretical) = R eq (experimental) = Ohm 13
14 Power dissipated = diagram work Circuit 3 R eq (theoretical) = R eq (experimental) = Power dissipated = diagram work Circuit 4 R eq (theoretical) = R eq (experimental) = Power dissipated = diagram work Ohm 14
15 Circuit 5 R eq (theoretical) = R eq (experimental) = Power dissipated = diagram work Ohm 15
RESISTANCE & OHM S LAW (PART I
RESISTANCE & OHM S LAW (PART I and II) Objectives: To understand the relationship between potential and current in a resistor and to verify Ohm s Law. To understand the relationship between potential and
More informationPhysics 1021 Experiment 6. Ohm s Law and Equivalent Resistance V=IR. Georg Simon Ohm ( )
1 Physics 1021 Ohm s Law and Equivalent Resistance V=IR Georg Simon Ohm (17891854) 2 Ohm s Law Electric current, I, is a measure of the flow of charge. It is rate of charge with time across a given point
More informationLab 3  DC Circuits and Ohm s Law
Lab 3 DC Circuits and Ohm s Law L31 Name Date Partners Lab 3  DC Circuits and Ohm s Law OBJECTIES To learn to apply the concept of potential difference (voltage) to explain the action of a battery in
More informationName Partner Date Class
Name Partner Date Class Ohm's Law Equipment: Resistors, multimeters, VOM, alligator clips, wires, breadboard, batteries, 1/4 or 1/2 Amp fuse, low voltage power supply. Object: The object of this exercise
More informationResistance, Ohm s Law, and the Temperature of a Light Bulb Filament
Resistance, Ohm s Law, and the Temperature of a Light Bulb Filament Name Partner Date Introduction Carbon resistors are the kind typically used in wiring circuits. They are made from a small cylinder of
More informationExperiment 15: Ohm s Law
Experiment 15: Ohm s Law Figure 15.1: Simple Series Circuit EQUIPMENT Universal Circuit Board Power Supply (2) DMM s 150 Resistor (R 1 ) 330 Resistor (R 2 ) 560 Resistor (R 3 ) Miniature Light Bulb and
More informationOhm s Law and Simple DC Circuits
Ohm s Law and Simple DC Circuits 2EM Object: Apparatus: To confirm Ohm s Law, to determine the resistance of a resistor, and to study currents, potential differences, and resistances in simple direct current
More informationSeries and Parallel Resistive Circuits Physics Lab VIII
Series and Parallel Resistive Circuits Physics Lab VIII Objective In the set of experiments, the theoretical expressions used to calculate the total resistance in a combination of resistors will be tested
More informationR A _ + Figure 2: DC circuit to verify Ohm s Law. R is the resistor, A is the Ammeter, and V is the Voltmeter. A R _ +
Physics 221 Experiment 3: Simple DC Circuits and Resistors October 1, 2008 ntroduction n this experiment, we will investigate Ohm s Law, and study how resistors behave in various combinations. Along the
More informationLab 3 Ohm s Law and Resistors
` Lab 3 Ohm s Law and Resistors What You Need To Know: The Physics One of the things that students have a difficult time with when they first learn about circuits is the electronics lingo. The lingo and
More informationLab 4  Ohm s Law and Kirchhoff s Circuit Rules
Lab 4 Ohm s Law and Kirchhoff s Circuit Rules L41 Name Date Partners Lab 4 Ohm s Law and Kirchhoff s Circuit Rules OBJECTIES To learn to apply the concept of potential difference (voltage) to explain the
More informationBasic Ohm s Law & Series and Parallel Circuits
2:256 Let there be no compulsion in religion: Truth stands out clear from Error: whoever rejects evil and believes in Allah hath grasped the most trustworthy handhold that never breaks. And Allah heareth
More informationElectrical Measurements
Electrical Measurements Experimental Objective The objective of this experiment is to become familiar with some of the electrical instruments. You will gain experience by wiring a simple electrical circuit
More informationElectronicsLab1.nb 1. Electronics Lab #1. Ohm's Law and Simple Circuits
ElectronicsLab1.nb 1 Electronics Lab #1 Ohm's Law and Simple Circuits In this laboratory, you will verify Ohm's law V=iR where V is the voltage, i is the current and R is the resistance. You will learn
More informationCircuitsCircuit Analysis
Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9volt battery is connected to a 4ohm resistor and a 5ohm resistor as shown in the diagram below. A 3.0ohm resistor,
More informationR Ω. II. Experimental Procedure. Ohm's Law
I. Theory Ohm's Law In this lab we will make detailed measurements on a resistor to see if it obeys Ohm's law. We will also check the rules for combining resistors in series and parallel. Ohm's law describes
More informationOHM S LAW 05 AUGUST 2014
OHM S LAW 05 AUGUST 2014 In this lesson, we: Current Lesson Description Revise the definitions of current, potential difference and emf Explore Ohm s law Identify the characteristics of ohmic and nonohmic
More information3 DC Circuits, Ohm's Law and Multimeters
3 DC Circuits, Ohm's Law and Multimeters Theory: Today's lab will look at some basics of electricity and how these relate to simple circuit diagrams. Three basic terms are important to a study of electricity.
More informationPHYSICS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits
PHYSCS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits This experiment is designed to investigate the relationship between current and potential in simple series
More informationCircuits and Resistivity
Circuits and Resistivity Look for knowledge not in books but in things themselves. W. Gilbert OBJECTIVES To learn the use of several types of electrical measuring instruments in DC circuits. To observe
More informationPHYSICS 176 UNIVERSITY PHYSICS LAB II. Experiment 2 (two weeks) Direct Current Measurement and Ohm's Law
PHYSICS 176 UNIVERSITY PHYSICS LAB II Experiment 2 (two weeks) Direct Current Measurement and Ohm's Law Equipment: Supplies: VOM (voltohmmilliammeter), digital multimeter, power supply. 1/2 watt carbon
More informationDC Circuits (Combination of resistances)
Name: Partner: Partner: Partner: DC Circuits (Combination of resistances) EQUIPMENT NEEDED: Circuits Experiment Board One Dcell Battery Wire leads Multimeter 100, 330, 1k resistors Purpose The purpose
More informationCHAPTER 2. Basic Electronics & Theory. (The rules behind all those little things)
CHAPTER 2 Basic Electronics & Theory (The rules behind all those little things) 1 Current, Voltage, Resistance Water flowing through a hose is a good way to imagine electricity. Water is like Electrons
More informationAP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules
Name Period AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Dr. Campbell 1. Four 240 Ω light bulbs are connected in series. What is the total resistance of the circuit? What
More informationEDEXCEL 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 informationCircuits. Page The diagram below represents a series circuit containing three resistors.
Name: Circuits Date: 1. Which circuit segment has an equivalent resistance of 6 ohms? 4. The diagram below represents a series circuit containing three resistors. 2. Base your answer to the following question
More informationGoals. Introduction R = DV I (7.1)
Lab 7. Ohm s Law Goals To understand Ohm s law, used to describe the behavior of electrical conduction in many materials and circuits. To calculate the electrical power dissipated as heat in electrical
More informationBasic DC Circuits. Electrical Quantity Description Unit Water Analogy Voltage or Potential Difference
Basic DC Circuits Current and voltage can be difficult to understand, because the flow of electrons and potential differences cannot be observed by the unaided human eye. To clarify these terms, some people
More informationResistors in Series and Parallel
Resistors in Series and Parallel INTRODUCTION Direct current (DC) circuits are characterized by the quantities current, voltage and resistance. Current is the rate of flow of charge. The SI unit is the
More informationExperiment #3, Ohm s Law
Experiment #3, Ohm s Law 1 Purpose Physics 182  Summer 2013  Experiment #3 1 To investigate the oltage, , characteristics of a carbon resistor at room temperature and at liquid nitrogen temperature,
More informationA) The potential difference across the 6ohm B) 2.0 A resistor is the same as the potential difference across the 3ohm resistor. D) 4.
1. A 2.0ohm resistor and a 4.0ohm resistor are connected in series with a 12volt battery. If the current through the 2.0ohm resistor is 2.0 amperes, the current through the 4.0ohm resistor is A) 1.0
More informationActivity 1: Light Emitting Diodes (LEDs)
Activity 1: Light Emitting Diodes (LEDs) Time Required: 45 minutes Materials List Group Size: 2 Each pair needs: One each of the following: One Activity 1 bag containing: o Red LED o Yellow LED o Green
More informationElectronic Trainer. Combined Series and Parallel Circuits
Electronic Trainer Combined Series and Parallel Circuits In this lab you will work with a circuit combining series and parallel elements. You will use six resistors to create a circuit with two parallel
More informationCHAPTER12. Electricity. Multiple Choice Questions. Fig. 12.1
CHAPTER12 Electricity Multiple Choice Questions 1. A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure12.1. The current recorded in the ammeter will be Fig. 12.1
More informationOhmic and Non Ohmic Devices
Experiment 1 17 Kuwait University Physics 107 Physics Department Ohmic and Non Ohmic Devices Introduction In this experiment, you will study Ohm s law by examining the IV characteristics of a fixed resistor,
More informationElectrostatics. Electrostatics Version 2
1. A 150watt lightbulb is brighter than a 60.watt lightbulb when both are operating at a potential difference of 110 volts. Compared to the resistance of and the current drawn by the 150watt lightbulb,
More informationElectric Circuits II
Electric Circuits II Experiment 4: Resistances in Circuits Equipment needed:  AC/DC Electronic Lab Board: Resistors  Multimeter Purpose The purpose of this lab is to begin experimenting with the variables
More informationEE101  Lab 2: Resistive Circuits. Resistor Color Codes  Note: carbon composition resistors will be used
EE101  Lab 2: Resistive Circuits ALL PRELABS ARE TO BE COMPLETED ON SEPARATE PAPER AND TURNED IN AT THE BEGINNING OF THE LAB PERIOD (MAKE A COPY TO USE DURING THE LAB). ALL LAB EXERCISES MUST BE COMPLETED
More informationExperiment #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 informationvery small Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: P31220 Lab
Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: Ohm s Law for electrical resistance, V = IR, states the relationship between
More informationPHY 101 Lab 7 on Electric circuits: Direct current circuits Your name: Other team members:
PHY 101 Lab 7 on Electric circuits: Direct current circuits Your name: Other team members: Goals: To explore the basic principles of electric circuits, and how to measure them. Materials: Electrical resistors
More informationAP* Electric Circuits Free Response Questions
AP* Electric Circuits Free Response Questions 1996 Q4 (15 points) A student is provided with a 12.0V battery of negligible internal resistance and four resistors with the following resistances: 100 Ω,
More information`Ohm s Law III  Resistors in Series and Parallel
`Ohm s Law III  esistors in Series and Parallel by Dr. ames E. Parks Department of Physics and Astronomy 40 Nielsen Physics Building he University of ennessee Knoxville, ennessee 799600 Copyright August,
More informationSeries & Parallel Circuits Challenge
Name: Part One: Series & Parallel Circuits Challenge 1. Build a circuit using two batteries and two light bulbs in a way to illuminate the two light bulbs so that if either light bulb is disconnected,
More informationChapter 6. Experiment 4: Electric Currents and Circuits. 6.1 Introduction The Electric Current
Chapter 6 Experiment 4: Electric Currents and Circuits 6.1 Introduction The resistance to the flow of an electric current is essential in the design of electronic devices and electric circuits generally.
More informationIntro to Circuits Lab #1
Intro to Circuits Lab #1 Anatomy of a Breadboard: The breadboard is where you will be assembling your circuits. The breadboard is composed of rows and columns of metal clips. These clips are housed in
More informationElectric Circuits II. Physics 133 Experiments Electric Circuits II 1
Physics 133 Experiments Electric Circuits II 1 Electric Circuits II GOALS To examine Ohm's Law: the pivotal relationship between voltage and current for resistors To closely study what current does when
More information1) 10. V 2) 20. V 3) 110 V 4) 220 V
1. The diagram below represents an electric circuit consisting of a 12volt battery, a 3.0ohm 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 informationIntroduction to Electric Circuits. Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos
Introduction to Electric Circuits Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos Electrical Circuits (Over)simplified The simple model of matter is that it is made
More information8.3. Resistance and Ohm s Law. Did You Know? Resistance and the Flow of Electrons. Words to Know
8.3 Resistance and Ohm s Law Resistance slows down the flow of electrons and transforms electrical energy. Resistance is measured in ohms ( ). We calculate resistance by applying a voltage and measuring
More informationPeople s Physics Book
The Big Ideas: The name electric current is given to the phenomenon that occurs when an electric field moves down a wire at close to the speed of light. Voltage is the electrical energy density (energy
More informationKirchhoff s Laws. Kirchhoff's Law #1  The sum of the currents entering a node must equal the sum of the currents exiting a node.
Kirchhoff s Laws There are two laws necessary for solving circuit problems. For simple circuits, you have been applying these equations almost instinctively. Kirchhoff's Law #1  The sum of the currents
More information1 THE LIGHT BULB EXPERIMENT: Exploring Simple Electric Circuits
1 THE LIGHT BULB EXPERIMENT: Exploring Simple Electric Circuits Preparatory Questions for Review: (also read this guide sheet, which contains some of the answers!) 1. State Ohm s Law, defining every term
More information= 1 R 1 + (2) + 1 R R 2
PHYS 140 General Physics II EXPERIMENT 4 SERIES AND PARALLEL RESISTANCE CIRCUITS I. OBJECTIVE: The objective of this experiment is the study of series and parallel resistive circuits. The student will
More informationLab #2: Parallel and Series Resistors
Fall 2013 EELE 250 Circuits, Devices, and Motors Lab #2: Parallel and Series Resistors Scope: Use a multimeter to measure resistance, DC voltage, and current Use the color code for resistors. Use the prototypeboard
More informationFig. 1 Analogue Multimeter Fig.2 Digital Multimeter
ELECTRICAL INSTRUMENT AND MEASUREMENT Electrical measuring instruments are devices used to measure electrical quantities such as electric current, voltage, resistance, electrical power and energy. MULTIMETERS
More informationExperiment 3 ~ Ohm's Law, Measurement of Voltage, Current and Resistance
Experiment 3 ~ Ohm's Law, Measurement of Voltage, Current and Resistance Objective: In this experiment you will learn to use the multimeter to measure voltage, current and resistance. Equipment: Bread
More informationENGR 1181 Lab 3: Circuits
ENGR 1181 Lab 3: Circuits Lab Procedure Report Guidelines 2 Goal of the Circuits: The Circuits Lab introduces series and parallel circuit which are used by engineers. Students will review this document
More informationesiexperiment 1: Electrical Resistance and the Resistor
esiexperiment : Electrical Resistance and the Resistor Introduction Ohm s law is the most fundamental equation in electric circuit analysis. It states that the amount of electric current flowing in a circuit
More informationElectronicsLab2.nb. Electronics Lab #2. Simple Series and Parallel Circuits
Electronics Lab #2 Simple Series and Parallel Circuits The definitions of series and parallel circuits will be given in this lab. Also, measurements in very simple series and parallel circuits will be
More informationResistance and Ohm s Law  MBL
Resistance and Ohm s Law  MBL In this experiment you will investigate different aspects of Ohm s Law, which relates voltage, current, and resistance. A computer will be used to collect, display, and help
More informationParallel Resistance, Series/Parallel Circuit Combinations, and Power Consumption
Lab #18 Parallel/Series Resistors page 1 Parallel Resistance, Series/Parallel Circuit Combinations, and Power Consumption Reading: Giambatista, Richardson, and Richardson Chapter 18 (18.118.9, 18.11).
More informationOhm s Law. 1 Object. 2 Apparatus. 3 Theory. To study resistors, Ohm s law, linear behavior, and nonlinear behavior.
Ohm s Law Object To study resistors, Ohm s law, linear behavior, and nonlinear behavior. pparatus esistors, power supply, meters, wires, and alligator clips. Theory resistor is a circuit element which
More informationQ1. (a) Complete the sentence below to name the instrument used to measure electrical current.
Q. (a) Complete the sentence below to name the instrument used to measure electrical current. The instrument used to measure electrical current is called... () (b) In the diagram below each box contains
More informationQ1. (a) The diagram shows the voltagecurrent graphs for three different electrical components.
Q. (a) The diagram shows the voltagecurrent graphs for three different electrical components. Which one of the components A, B or C could be a 3 volt filament lamp? Explain the reason for your choice...................
More informationLab E1: Introduction to Circuits
E1.1 Lab E1: Introduction to Circuits The purpose of the this lab is to introduce you to some basic instrumentation used in electrical circuits. You will learn to use a DC power supply, a digital multimeter
More informationName Date: Course number: MAKE SURE TA & TI STAMPS EVERY PAGE BEFORE YOU START EXPERIMENT 9. Superconductivity & Ohm s Law
Laboratory Section: Last Revised on January 6, 2016 Partners Names: Grade: EXPERIMENT 9 Superconductivity & Ohm s Law 0. PreLaboratory Work [2 pts] 1. Define the critical temperature for a superconducting
More informationPHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three and FourTerminal Black Boxes
PHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three and FourTerminal Black Boxes Print Your Name Print Your Partners' Names Instructions February 5, 2015 Before
More informationMeasuring Electric Phenomena: the Ammeter and Voltmeter
Measuring Electric Phenomena: the Ammeter and Voltmeter 1 Objectives 1. To understand the use and operation of the Ammeter and Voltmeter in a simple direct current circuit, and 2. To verify Ohm s Law for
More informationResistors. Jeffrey La Favre
1 Resistors Jeffrey La Favre Resistors One of the most basic components (parts) used in electronics is the resistor. Resistors are used to control the amount of current that flows in a circuit and to reduce
More informationLab 5: Simple Electrical Circuits
Lab 5: Simple Electrical Circuits Introduction: In this laboratory you will explore simple DC (direct current) electrical circuits. The primary goal of the lab will be to develop a model for electricity.
More informationExperiment #5, Series and Parallel Circuits, Kirchhoff s Laws
Physics 182 Summer 2013 Experiment #5 1 Experiment #5, 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 informationResistors in Series and Parallel Circuits
69 Resistors in Series and Parallel Circuits E&M: Series and parallel circuits Equipment List DataStudio file: Not Required Qty s Part Numbers 1 C/DC Electronics Lab EM8656 2 D cell 1.5 volt Introduction
More informationTHE BREADBOARD; DC POWER SUPPLY; RESISTANCE OF METERS; NODE VOLTAGES AND EQUIVALENT RESISTANCE; THÉVENIN EQUIVALENT CIRCUIT
THE BREADBOARD; DC POWER SUPPLY; RESISTANCE OF METERS; NODE VOLTAGES AND EQUIVALENT RESISTANCE; THÉVENIN EQUIVALENT CIRCUIT YOUR NAME LAB MEETING TIME Reference: C.W. Alexander and M.N.O Sadiku, Fundamentals
More informationUsing Ohm s Law to Build a Voltage Divider
Using Ohm s Law to Build a Voltage Provided by TryEngineering  Lesson Focus Students will design, build, and characterize one of the basic circuits of electrical engineering, the voltage divider. These
More informationLab 1: DC Measurements (R, V, I)
Lab 1: DC Measurements (R, V, I) Introduction Resistors are the most common component found in all electrical and electronic circuits. Resistors are found in many shapes, sizes, and values. The most common
More informationEXPERIMENT 7 OHM S LAW, RESISTORS IN SERIES AND PARALLEL
260 7 I. THEOY EXPEIMENT 7 OHM S LAW, ESISTOS IN SEIES AND PAALLEL The purposes of this experiment are to test Ohm's Law, to study resistors in series and parallel, and to learn the correct use of ammeters
More informationLab #2: NonIdeal Sources and Renewable Energy Sources
Lab #2: NonIdeal Sources and Renewable Energy Sources Theory & Introduction Goals for Lab #2 The goals for this lab are to introduce you to the limitations of real power sources and compare them to the
More informationRUTGERS UNIVERSITY The State University Of New Jersey School Of Engineering Department Of Electrical And Computer Engineering
1 RUTGERS UNIVERSITY The State University Of New Jersey School Of Engineering Department Of Electrical And Computer Engineering 332:223 Principles of Electrical Engineering I Laboratory Experiment #1 Title:
More informationInternational Islamic University Chittagong Department of Electrical & Electronics Engineering
International Islamic University Chittagong Department of Electrical & Electronics Engineering Course No: EEE 1102 Course Title: Electrical Circuit I Sessional Experiment No : 01 Experiment Name: Introduction
More informationOhm s Law and Simple Electrical Connections
Ohm s Law and Simple Electrical Connections Purpose: To experimentally verify Ohm s Law and to provide experience in making series and parallel electrical connections. TO OD RUNNG FUSES CHECK LL CRCUT
More informationScience 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 informationSIMPLE ELECTRIC CIRCUITS
18 Preparatory Questions: (also read this guide sheet, which contains some of the answers!) 1. State Ohm s Law, defining every term in the equation. 2. If a bulb connected directly to a 6 V battery glows
More informationSection 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate. Learning Outcomes
Section 4: Ohm s Law: Putting up a Resistance Section 4 Ohm s Law: Putting up a Resistance What Do You See? Learning Outcomes In this section, you will Calculate the resistance of an unknown resistor given
More informationPHYS2212 LAB Ohm s Law and Measurement of Resistance
Objectives PHYS2212 LAB Ohm s Law and Measurement of Resistance Part I: Comparing the relationship between electric current and potential difference (voltage) across an ohmic resistor with the voltagecurrent
More information3_given a graph of current_voltage for a resistor, determine the resistance. Three resistance R1 = 1.0 kω, R2 = 1.5 kω, R3 = 2.
Ohm s Law Objectives: 1_measure the current_voltage curve for a resistor 2_construct a graph of the data from objective 1 3_given a graph of current_voltage for a resistor, determine the resistance Equipment:
More information[2]...[1] [3]
High Demand Questions QUESTIONSHEET 1 (a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P Q Calculate the current that passes through
More informationElectrical Fundamentals Module 3: Parallel Circuits
Electrical Fundamentals Module 3: Parallel Circuits PREPARED BY IAT Curriculum Unit August 2008 Institute of Applied Technology, 2008 ATE310 Electrical Fundamentals 2 Module 3 Parallel Circuits Module
More informationExam 2. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.
Class: Date: Exam 2 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. You wish to measure a current through a resistor. You should connect the measuring
More informationExperiment #4: Basic Electrical Circuits
Purpose: Equipment: Discussion: Experiment #4: Basic Electrical Circuits Rev. 07042006 To construct some simple electrical circuits which illustrate the concepts of current, potential, and resistance,
More informationLab 1: DC Circuits. Student 1, student1@ufl.edu Partner : Student 2, student2@ufl.edu
Lab Date Lab 1: DC Circuits Student 1, student1@ufl.edu Partner : Student 2, student2@ufl.edu I. Introduction The purpose of this lab is to allow the students to become comfortable with the use of lab
More informationOhm s Law. Electrical Quantity Description Unit Water Analogy Voltage or Potential Difference
Ohm s Law Experiment 25 The fundamental relationship among the three important electrical quantities current, voltage, and resistance was discovered by Georg Simon Ohm. The relationship and the unit of
More informationSeries and Parallel Circuits
Series and Parallel Circuits Ver. 1.2 In this experiment we will investigate the properties of several resistors connected in series and parallel. Our purpose is to verify the simple equations for the
More informationPHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (IV) curves
Purpose: PHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (IV) curves Measure the current voltage curve of a light bulb and a resistor using a variable d.c. power supply. Understanding of Ohm
More informationChapter 7 DirectCurrent Circuits
Chapter 7 DirectCurrent Circuits 7. Introduction...77. Electromotive Force...73 7.3 Resistors in Series and in Parallel...75 7.4 Kirchhoff s Circuit Rules...77 7.5 VoltageCurrent Measurements...79
More informationLab 9 Kirchhoff s Laws and Wheatstone Bridge
Lab 9 Kirchhoff s Laws and Wheatstone Bridge Learning Goals to explore Kirchhoff s two laws of electrical circuits to use a voltage sensor, current sensor, and the DataStudio software to measure the voltage
More informationElectrical Circuits. Ammeter Light Bulb Ohmmeter. Power Supply Resistor Voltmeter. Symbols for Electrical Components.
PHSC 101 Electrical Circuits Name Purpose To learn how to measure resistance, voltage, and current using a multimeter. To become familiar with the basic components of simple electrical circuits and Ohm's
More informationINGREDIENTS SWITCH LED 220 OHM RESISTOR
01 SWITCH LED 220 OHM RESISTOR INGREDIENTS 21 GET TO KNOW YOUR TOOLS YOU LL MAKE A SIMPLE CIRCUIT WITH SOME SWITCHES, AN LED, AND A RESISTOR Discover: basic electrical theory, how a breadboard works, components
More informationLab 5 RC Circuits. What You Need To Know: Physics 226 Lab
Lab 5 R ircuits What You Need To Know: The Physics In the previous two labs you ve dealt strictly with resistors. In today s lab you ll be using a new circuit element called a capacitor. A capacitor consists
More informationElectronicsLab5.nb. Electronics Lab #5. Thevenin's Theorem
Electronics Lab #5 Thevenin's Theorem Often you deal with a complicated electronic circuit. It is often the case that the behavior of one particular component is crucial. For example, you could have an
More information