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


 Melanie Reed
 1 years ago
 Views:
Transcription
1 Circuits with inductors and alternating currents Chapter 20 #45, 46, 47, 49
2 RL circuits Ch. 20 (last section) Symbol for inductor looks like a spring. An inductor is a circuit element that has a large inductance. (usually a coil of wire). Because of the inductance in a RL circuit, the current changes gradually. When you close a switch, the current takes time to go from zero to its maximal value.
3 The time it takes for the current to rise depends on the time constant. In a RC circuit, time constant ( ) depended on the resistance and the capacitance. = RC In a RL circuit, = L/R See graph of current vs. time on pg. 684 After each time constant, the current rises to 63.2% of the remainder to the max value. I R (1 e t / ) I R (1 e Rt / L )
4 RL circuit The larger the time constant the longer it takes for the current to reach its maximum value. = L/R increase inductance, increase increase resistance, decrease Note the difference between RL and RC circuits.
5 Behavior of the inductor Take a RL circuit with the switch open. (fig ) When the switch is closed, the current is changing the most rapidly. The back emf from the inductor is largest at this time. As the current approaches the steady state value, the back emf is reduced. After a long time, the inductor behaves like a ordinary wire. Do example 20.8.
6 Ch. 21 AC circuits concept # 2, 8, 13, 15 problems# 1, 5, 7, 9, 11, 13, 14, 18, 19, 29, 37, 39, 43, 45, 47
7 AC circuit consists of an AC generator or other AC source hooked up to electrical devices: capacitors, resistors, inductors The voltage alternates between a maximum and minimum value. The output is a sinusoidal wave v = V max sin 2 ft v = instantaneous voltage f = frequency at which the voltage changes t = time
8 The current spends just as much time going current in one direction as it does with the current going the opposite direction. The average current is zero. RMS current (I rms ) The square root of the mean of the square I rms = Imax Imax 2
9 For the AC circuit with the resistor. The current and the voltage peak at the same time. See fig. on pg 697 for a AC circuit with a resistor. They are said to be in phase. applying Ohm s law V V rms = max V max V rms = I rms R and V max = I max R Average Power: P ave I 2 rms R
10 Capacitors in AC circuit Circuit with AC source and capacitor: At initial time there is no charge on the capacitor. The current is maximum then because there is no charge to fight the new charges from moving onto the plates. The current decreases as the charge build up. (the voltage across capacitor increases) When the current reverses direction, the voltage drops because the plates are losing their charge. This process repeats over an over again. See the figures on page 700.
11 Capacitors in AC circuit The current peaks before the voltage. The current and voltage are not in phase. The voltage lags behind the current by Impeding effect of a capacitor is called the capacitance reactance X c. X c = 1/(2 fc) X c depends on the fequency V c,rms = I rms X c
12 Inductors in AC circuit Inductor is a coil and due to Faraday s law the inductor impedes a changing current. The effective resistance of an inductor is called the inductive reactance, X L. X L = 2 fl depends on frequency. Because of the inductance, the current lags behind the voltage. They are out of phase. See fig on pg 701. The voltage peaks before the current.
13 RLC circuit Now a resistor, capacitor, and inductor are all in an AC circuit. Because the voltages across all the components are not in phase, we cannot just add them together. They need to be added like vectors. See figures 21.9 and The total impedance, Z, of the circuit is 2 2 defined as: Z R ( X L X C ) V max = I max Z see table 21.2
14 Phase shift between potential difference and current is. tan X L X C R see figure 21.11
15 Power in AC circuit Energy stored in capacitor is PE c = ½ C( V max ) 2 During half of a cycle the capacitor is charged. During the other half the charge returns to the voltage source. Average power supplied by the source is zero. No power losses occur in capacitor in AC circuit.
16 Energy stored in inductor is PE L = ½ L(I max ) 2 The current source does work against the back emf of the inductor. When the current decreases the stored energy is returned to the source as the inductor attempts to maintain the current in the circuit. There is no power loss through the inductor. All the power in RLC circuit is converted to internal energy in the resistor. 2 In RLC circuit P av I rms R
17 power P av I 2 rms R P av I rms V R V R V rms cos P av I rms V rms cos cos = power factor The power depends on the phase shift between the current and voltage. If a large generator has a large inductance, capacitors can be used to shift the phase.
18 Resonance in series RLC circuit. I rms When the impedance has its minimum value the current is maximized. This happens when: X L = X C Then Z = R V Z rms R This happens when the frequency of the circuit is just right. Called the resonance frequency. 2 V rms ( X X ) L C 2
19 Resonance frequency. To find the resonance frequency, f 0. Set the X L = X C 2 f 0 L = 1/(2 f 0 C) f LC See fig At f = f 0, the current spikes. If the resistance was zero, the current would become infinite.
20 Transformer Used to change the magnitude of an AC voltage. Works on basis of Faraday s Law. Simple transformer is made up of 2 coils wrapped around a soft iron core. When the current through the primary coil changes, the flux through the secondary coil changes producing an induced emf. The voltages in each coil is proportional to the number of turns in the coil.
21 Transformer V 1 = N 1 B / t and V 2 = N 2 B / t Assuming no flux is lost in the iron core, the term B/ t is common to both coils. V 2 = (N 2 /N 1 ) V 1 When N 2 >N 1 the voltage is increased, step up transformer. When N 2 < N 1 the voltage is decreased, step down transformer.
22 The power input to the primary coil equals the power output at the secondary coil for an ideal transformer. (No power loss) I 1 V 1 = I 2 V 2 So for a step up transformer the voltage is increased, but the current is decreased. In a real transformer, there is some power loss due to eddy currents in the iron core. Real transformers have efficiencies ranging from 90%  99%.
23 Power lost due to the currents in transmission lines is lost as resistive heating. P = I 2 R Want the current to be as small as possible to reduce power loss. More economical to transmit electric power using high voltage and low current.
Inductance and Alternating Current Circuits
1 Selfinductance Consider a circuit consisting of a switch, a resistor, and an emf. S I B R When the switch is closed, the current does not change immediately from zero to its maximum value ε/r but only
More informationLesson 27. (1) Root Mean Square. The emf from an AC generator has the time dependence given by
Lesson 27 () Root Mean Square he emf from an AC generator has the time dependence given by ℇ = ℇ "#$% where ℇ is the peak emf, is the angular frequency. he period is he mean square value of the emf is
More informationBasic Electrical Theory
Basic Electrical Theory Impedance PJM State & Member Training Dept. PJM 2014 10/24/2013 Objectives Identify the components of Impedance in AC Circuits Calculate the total Impedance in AC Circuits Identify
More informationNOTES ON ALTERNATING CURRENT (Class 12) Page 01
NOTES ON ALTERNATING CURRENT (Class 12) Page 01 Alternating current (A.C) is the current that changes in magnitude direction continuously with respect to time. It can be represented as, The currents and
More informationTransformers, Reactance, Resonance and Impedance. Transformers and Turns Ratios Capacitive and Inductive Reactance Resonance and Impedance Matching
Transformers, Reactance, Resonance and Impedance Transformers and Turns Ratios Capacitive and Inductive Reactance Resonance and Impedance Matching Review Two types of current: AC Charge movement alternates
More informationDC vs AC. Chapter 21 AC Circuits. DC vs AC. DC vs AC. Electromagnetic Induction. Faraday s Experiment 2/27/2012. DC = Direct current
DC vs AC Chapter 21 AC Circuits DC = Direct current Electrons flow constantly Electrons only flow in one direction (negative to positive) Batteries provide DC current DC vs AC DC vs AC AC = Alternating
More informationUniversity Physics (Prof. David Flory) Chapt_33 Monday, August 06, 2007
Name: Date: 1. A series RL circuit is connected to an emf source of angular frequency ω. The current: A) leads the applied emf by tan 1 (ωl/r) D) leads the applied emf by tan 1 (ωr/l) B) lags the applied
More informationChapter 35 Alternating Current Circuits
hapter 35 Alternating urrent ircuits acircuits Phasor Diagrams Resistors, apacitors and nductors in acircuits R acircuits acircuit power. Resonance Transformers ac ircuits Alternating currents and
More informationLab 7: LRC Circuits. Purpose. Equipment. Principles
Lab 7: LRC Circuits Purpose This experiment is an introduction to alternating current (AC) circuits. Using the oscilloscope, we will examine the frequency response of inductors, resistors and capacitors
More informationLRC Circuits. Purpose. Principles PHYS 2211L LAB 7
Purpose This experiment is an introduction to alternating current (AC) circuits. Using the oscilloscope, we will examine the voltage response of inductors, resistors and capacitors in series circuits driven
More informationChapter 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 informationApril 8. Physics 272. Spring Prof. Philip von Doetinchem
Physics 272 April 8 Spring 2014 http://www.phys.hawaii.edu/~philipvd/pvd_14_spring_272_uhm.html Prof. Philip von Doetinchem philipvd@hawaii.edu Phys272  Spring 14  von Doetinchem  218 LC in parallel
More information1 of 6 4/28/2010 2:12 PM
http://sessionmasteringphysicscom/myct/assignmentprint?assignmentid= 1 of 6 4/28/2010 2:12 PM Chapter 36 Homework Due: 8:00am on Wednesday, April 28, 2010 Note: To understand how points are awarded, read
More informationRMS Values. Topic Nine: Alternating Current (AC) Electricity (AS 90523, Physics 3.6) Mains electricity. Power. RMS (root mean square) values
Topic Nine: Alternating Current (AC) Electricity (AS 90523, Physics 3.6) RMS alues Objectives By the end of this section you should be able to: 1 state the relationship between RMS and maximum value for
More informationChapter 30 Inductance, Electromagnetic Oscillations, and AC Circuits. Copyright 2009 Pearson Education, Inc.
Chapter 30 Inductance, Electromagnetic Oscillations, and AC Circuits Units of Chapter 30 Mutual Inductance SelfInductance Energy Stored in a Magnetic Field LR Circuits LC Circuits and Electromagnetic
More informationPHYS 221 General Physics II
PHYS 22 General Physics II Resonance, Impedance, Transformers, Motors Spring 25 Assigned Reading: 22.6 22. ecture 5 Review: SelfInduction: Changing current through a loop induces an opposing voltage in
More information8  ALTERNATING CURRENT Page Alternating Voltage and Alternating Current ( A. C. ) Φ 0 = N A B = N A B cos 0 = N A B and. Φ t = N A B cos ωt
8 ALTENATING UENT Page 8. Alternating Voltage and Alternating urrent ( A.. ) The following figure shows N turns of a coil of conducting wire PQS rotating with a uniform angular speed with respect to the
More informationA31.1 A resistor is connected across an ac source as shown. For this circuit, what is the relationship between the instantaneous current i through the
Q31.1 A resistor is connected across an ac source as shown. For this circuit, what is the relationship between the instantaneous current i through the resistor and the instantaneous voltage v ab across
More informationDirect versus Alternating Current Things We Can Measure
Phil Sherrod W4PHS Direct versus Alternating Current Things We Can Measure Direct Current (DC) Alternating Current (AC) Voltage Voltage (peak, RMS) Current Current (peak, effective) Power True power, Apparent
More informationFall 12 PHY 122 Homework Solutions #10
Fall 12 PHY 122 Homework Solutions #10 HW10: Ch.30 Q5, 8, 15,17, 19 P 1, 3, 9, 18, 34, 36, 42, 51, 66 Chapter 30 Question 5 If you are given a fixed length of wire, how would you shape it to obtain the
More informationThe Basic Inductor When a length of wire is formed onto a coil, it becomes a basic inductor. Magnetic lines of force around each loop in the winding
The Basic Inductor When a length of wire is formed onto a coil, it becomes a basic inductor. Magnetic lines of force around each loop in the winding of the coil effectively add to the lines of force around
More informationReactance and Impedance in RC and RL Circuits
Reactance and Impedance in RC and RL Circuits Consider the RC circuit shown which is connected to an alternating (AC) voltage source V(t). The circuit current I C, which is also the capacitive current,
More informationEXPERIMENT 5: SERIES AND PARALLEL RLC RESONATOR CIRCUITS
EXPERIMENT 5: SERIES AND PARALLEL RLC RESONATOR CIRCUITS Equipment List S 1 BK Precision 4011 or 4011A 5 MHz Function Generator OS BK 2120B Dual Channel Oscilloscope V 1 BK 388B Multimeter L 1 Leeds &
More informationExperiment 7 AC Circuits
Experiment 7 AC Circuits "Look for knowledge not in books but in things themselves." W. Gilbert (15401603) OBJECTIVES To study some circuit elements and a simple AC circuit. THEORY All useful circuits
More informationChapter 33. Alternating Current Circuits
Chapter 33 Alternating Current Circuits CHAPTE OUTLINE 33. AC Sources 33.2 esistors in an AC Circuit 33.3 Inductors in an AC Circuit 33.4 Capacitors in an AC Circuit 33.5 The LC Series Circuit 33.6 Power
More informationChapter 33. Alternating Current Circuits
Chapter 33 Alternating Current Circuits Multiple Choice 1. An ac generator with peak voltage 100 volts is placed across a 10Ω resistor. What is the average power dissipated? a. 100 W b. 150 W c. 500 W
More informationEXPERIMENT 4: MEASUREMENT OF REACTANCE OFFERED BY CAPACITOR IN DIFFERENT FREQUENCY FOR RC CIRCUIT
Kathmandu University Department of Electrical and Electronics Engineering BASIC ELECTRICAL LAB (ENGG 103) EXPERIMENT 4: MEASUREMENT OF REACTANCE OFFERED BY CAPACITOR IN DIFFERENT FREQUENCY FOR RC CIRCUIT
More informationBasic AC Reactive Components IMPEDANCE
Basic AC Reactive Components Whenever inductive and capacitive components are used in an AC circuit, the calculation of their effects on the flow of current is important. EO 1.9 EO 1.10 EO 1.11 EO 1.12
More information5. Smaller resistors usually have resistance value. A. small B. high C. low D. very small ANSWER: B
1. The total resistance of a two similar wire conductors connected in parallel is. A. resistance of one wire multiplied by 4 B. same resistance of one wire C. one half the resistance of one wire D. double
More informationInduced 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 informationET 304a Laboratory 8 Capacitive Reactance, Inductive Reactance and Series Impedance
ET 304a Laboratory 8 Capacitive Reactance, Inductive Reactance and Series Impedance Purpose: Experimentally verify the formulas for capacitive and inductive reactance. Observe how frequency affects the
More informationChapter 12. RL Circuits. Objectives
Chapter 12 RL Circuits Objectives Describe the relationship between current and voltage in an RL circuit Determine impedance and phase angle in a series RL circuit Analyze a series RL circuit Determine
More informationClicker Question. Right after switch S is closed, what will be the potential difference across the capacitor? A) 0 B) ε. E) ε R1/(R1+ R2) D) ε /2
Right after switch S is closed, what will be the potential difference across the capacitor? A) 0 B) ε C) ε R2/(R1+ R2) D) ε /2 E) ε R1/(R1+ R2) Right after switch S is closed, what will be the potential
More informationChapt ha e pt r e r 12 RL Circuits
Chapter 12 RL Circuits Sinusoidal Response of RL Circuits The inductor voltage leads the source voltage Inductance causes a phase shift between voltage and current that depends on the relative values of
More informationPractice Problems  Chapter 33 Alternating Current Circuits
Multiple Choice Practice Problems  Chapter 33 Alternating Current Circuits 4. A highvoltage powerline operates at 500 000 Vrms and carries an rms current of 500 A. If the resistance of the cable is
More informationAlternating Current Electricity Frequency and Period
Frequency and Period 151 Frequency (linear and angular) Period = T Average Value 152a Square wave, positive pulse = negative pulse: X ave = 0 Pulse pattern, positive, all the same: X ave = tx max T where
More informationElectromagnetic Induction
HB, MS 01212011 1 Electromagnetic Induction Equipment SWS, RLC circuit board, box with 2 coils and iron rod, magnet, 2 voltage sensors (no alligator clips), 2 leads (35 in.), bubble wrap to catch dropped
More informationExtra Questions  1. 1. What current will flow in a 20Ω resistor when it is connected to a 50V supply? a) 0.4A b) 1.6A c) 2.5A
Extra Questions  1 1. What current will flow in a 20Ω resistor when it is connected to a 50V supply? a) 0.4A b) 1.6A c) 2.5A 2. A current of 500mA flows in a resistance of 12Ω. What power is dissipated
More informationChapter 33  Electromagnetic Oscillations and Alternating Current
hapter 33  Electromagnetic Oscillations and Alternating urrent Problem Set #  due: h 333, 0, 7, 8, 3, 34, 39, 4, 56, 59, 6, 77, 80, 84, 85, 87 ecture Outline The ircuit The ircuit 3 Basic A ircuits
More informationElectromagnetic Induction
TS, HB, MS 04172012 1 Electromagnetic Induction Equipment DataStudio, RLC circuit board, box with 2 coils and iron rod, magnet, 2 voltage sensors (no alligator clips), 2 leads (35 in.), bubble wrap to
More information1) Magnetic field lines come out of the south pole of a magnet and enter at the north pole.
Exam Name 1) Magnetic field lines come out of the south pole of a magnet and enter at the north pole. 2) Which of the following statements is correct? A) Earth's north pole is magnetic north. B) The north
More informationALTERNATING CURRENTS
ALTERNATING CURRENTS VERY SHORT ANSWER QUESTIONS Q1. What is the SI unit of? Q2. What is the average value of alternating emf over one cycle? Q3. Does capacitor allow ac to pass through it? Q4. What
More informationChapter 22: Alternating current. What will we learn in this chapter?
Chapter 22: Alternating current What will we learn in this chapter? Contents: Phasors and alternating currents Resistance and reactance Series R L C circuit Power in accircuits Series resonance Parallel
More informationModule 25: AlternatingCurrent Circuits 1 Table of Contents
1 Module 5: AlternatingCurrent Circuits 1 Table of Contents 1.1 AC Sources... 11. Simple AC circuits... 13 1..1 Purely esistive load... 13 1.. Purely Inductive oad... 15 1..3 Purely Capacitive oad...
More informationInductors. In a circuit diagram, an inductor is shown like this:
Inductors An inductor (also called a choke) is simply a coil of wire. It turns out, however, that a coil of wire can do some very interesting things because of the magnetic properties of a coil. There
More informationReactance and Impedance
Reactance and Impedance Capacitance in AC Circuits Professor Andrew H. Andersen 1 Objectives Describe capacitive ac circuits Analyze inductive ac circuits Describe the relationship between current and
More informationEDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5  ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4  ALTERNATING CURRENT
EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5  ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 4  ALTERNATING CURRENT 4 Understand singlephase alternating current (ac) theory Single phase AC
More informationCHAPTER 2. Single and ThreePhase Power
CHAPTER 2 Single and ThreePhase Power 1 Objective Understand the difference between time and the phasor domains. Explain the magnitude and angular relation between the phase and line voltages in a
More informationNZQA registered unit standard 20431 version 2 Page 1 of 7. Demonstrate and apply fundamental knowledge of a.c. principles for electronics technicians
NZQA registered unit standard 0431 version Page 1 of 7 Title Demonstrate and apply fundamental knowledge of a.c. principles for electronics technicians Level 3 Credits 7 Purpose This unit standard covers
More informationElectrical Circuits and Components
Electrical Circuits and Components Resistors Resistance is provided in electrical circuits by resistors. The leads of a resistor can be axial or radial. Traditionally, resistor values are colour coded.
More informationCfE. Learning Outcomes. Unit 3 Electromagnetism. Advanced Higher
. CfE Advanced Higher Unit 3 Electromagnetism. Learning Outcomes 1 Name Teacher? I have some understanding but I need to revise this some more I don t know this or I need help because I don t understand
More informationDiodes have an arrow showing the direction of the flow.
The Big Idea Modern circuitry depends on much more than just resistors and capacitors. The circuits in your computer, cell phone, Ipod depend on circuit elements called diodes, inductors, transistors,
More informationPhysics 4B (Fall 2011) Chapter 31: Electromagnetic Oscillations and Alternating Current
Physics 4B (Fall 2011) Chapter 31: Electromagnetic Oscillations and Alternating Current People of mediocre ability sometimes achieve outstanding success because they don't know when to quit. Most men succeed
More informationHomework #11 20311721 Physics 2 for Students of Mechanical Engineering
Homework #11 20311721 Physics 2 for Students of Mechanical Engineering 2. A circular coil has a 10.3 cm radius and consists of 34 closely wound turns of wire. An externally produced magnetic field of
More informationLecture PowerPoints. Chapter 21 Physics: Principles with Applications, 7th edition Giancoli
Lecture PowerPoints Chapter 21 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 informationExperiment 9: Driven RLC Circuits
Amplitude Amplitude MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Experiment 9: Driven RLC Circuits OBJECTIVES 1. To explore the time dependent behavior of driven RLC Circuits 2. To
More informationSimple Harmonic Motion: AC circuits: alternating current electricity
Simple Harmonic Motion: AC circuits: alternating current electricity Alternating current (AC) circuits explained using time and phasor animations. Impedance, phase relations, resonance and RMS quantities.
More informationELECTRO MAGNETIC INDUCTION
ELECTRO MAGNETIC INDUCTION 1) A Circular coil is placed near a current carrying conductor. The induced current is anti clock wise when the coil is, 1. Stationary 2. moved away from the conductor 3. Moved
More informationNo Brain Too Small PHYSICS
ELECTRICITY: AC QUESTIONS AC CIRCUITS (2015;1) No Brain Too Small PHYSICS An AC circuit has a variable capacitor, an inductor, and a resistor in series, as shown. (a) Calculate the angular frequency of
More informationCourse Updates. Reminders: 1) Assignment #11 posted, due next Wednesday. 2) Quiz # 5 today (Chap 29, 30) 3) Complete AC Circuits
ourse Updates http://www.phys.hawaii.edu/~varner/phys7spr10/physics7.html eminders: 1) Assignment #11 posted, due next Wednesday ) Quiz # 5 today (hap 9, 30) 3) omplete A ircuits ast time: ircuits with
More informationEinstein Classes, Unit No. 102, 103, Vardhman Ring Road Plaza, Vikas Puri Extn., Outer Ring Road, New Delhi , Ph. : ,
1 EMI & AC 1. Derive an expression for the impendance of a coil in AC ciruit. A current of 1.1 A flows through a coil when connected to a 110 V DC. When 110 V AC of 50 Hz is applied to the same coil, only
More informationIntroduction. Physics E1b Expt 3: AC Circuits Spring 2007
Physics E1b Expt 3: AC Circuits Spring 2007 Introduction Preparation: Before coming to lab, read the lab handout and all course required reading in Giancoli through Chapter 21. Then answer the numbered
More informationChapter 9: Ideal Transformer. 10/9/2003 Electromechanical Dynamics 1
Chapter 9: Ideal Transformer 10/9/003 Electromechanical Dynamics 1 Introduction Transformers are one of the most useful electrical devices provides a change in voltage and current levels provides galvanic
More informationChapter 11. Inductors ISU EE. C.Y. Lee
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 informationChapter 15 10/14/2014
Chapter 15 Analyze series and parallel ac circuits to find Voltage Current Power Total impedance, admittance Apply known circuit theories Kirchhoff s current, voltage laws Voltage or current divider rule
More informationRL Circuits. OpenStax College
OpenStaxCNX module: m42425 1 RL Circuits OpenStax College This work is produced by OpenStaxCNX and licensed under the Creative Commons Attribution License 3.0 Abstract Calculate the current in an RL
More informationExperiment 12: AC Circuits  RLC Circuit
Experiment 12: AC Circuits  LC Circuit Introduction An inductor (L) is an important component of circuits, on the same level as resistors () and the capacitors (C). The inductor is based on the principle
More informationAC Ciruits and EM Waves
AC Ciruits and EM Waves 1. In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle? a. zero c. 90 b. 45 d. 180 2. The rate of heat dissipation in
More informationIn a multipolar (Ppole) machine running at a speed of N rpm, the frequency of generated emf is given by a. f = b. f = c. f = d.
The time period or periodic time T of an alternating quantity is the time taken in seconds to complete a. one cycle b. alternation c. none of the above d. Half cycle Answer: a The time period of an alternating
More informationEðlisfræði 2, vor 2007
[ Assignment View ] [ Pri Eðlisfræði 2, vor 2007 31. Alternating Current Circuits Assignment is due at 2:00am on Wednesday, March 21, 2007 Credit for problems submitted late will decrease to 0% after the
More informationAlternating Current Voltage and Power In an AC circuit, V and I are given by V 150sin ( 150t)
Alternating Current Voltage and Power 0. In an AC circuit, V and I are given by V 50sin ( 50t) volt, and I 50sin 50t + amp. The power dissipated in the circuit is 3 06 W b) 50 W c) 565 W d) Zero 00. An
More informationPhysics 1214 Chapter 21: Electromagnetic Induction 02/15
Physics 1214 Chapter 21: Electromagnetic Induction 02/15 1 Induction Experiments emf or electromotive force: (from Chapter 19) the influence that moves charge from lower to higher potential. induced current:
More informationAlternating Current Circuits and Electromagnetic Waves
Arecibo, a large radio telescope in Puerto Rico, gathers electromagnetic radiation in the form of radio waves. These long wavelengths pass through obscuring dust clouds, allowing astronomers to create
More informationLR Circuits INTRODUCTION DISCUSSION OF PRINCIPLES
LR Circuits INTRODUCTION The English physicist Michael Faraday 1 found in 1831 that when the current through a coil 2 changes, the coil produces a changing magnetic field (in addition to the field of the
More information1) A charged particle traveling opposite to a magnetic field does not experience a magnetic force. T 1)
Exam 2 Review Name TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) A charged particle traveling opposite to a magnetic field does not experience a magnetic force. T
More information!!" =!!" From the relation between the time rate of change of!! and that of in!!" :!!! =!!"
Lesson 25 (1) Mutual Induction Imagine two wire loops near by labeled 1 and 2. Loop 1 carries current which is changing in time. The magnetic flux it creates through loop 2 is also changing, and creates
More informationPhysics 241 Lab: RLC Circuit AC Source Name:
Physics 241 Lab: RLC Circuit AC Source http://bohrphysicsarizonaedu/~leone/ua/ua_spring_2010/phys241labhtml Name: Section 1: The RLC Circuit 11 In a circuit where an inductor, resistor and capacitor (RLC)
More informationalternating currents & electromagnetic waves
alternating currents & electromagnetic waves PHY232 Remco Zegers zegers@nscl.msu.edu Room W109 cyclotron building http://www.nscl.msu.edu/~zegers/phy232.html quiz (extra credit) R L I V At t=0, the switch
More informationLarge loop. Small ring
Q30.1 A small, circular ring of wire (shown in blue) is inside a larger loop of wire that carries a current I as shown. The small ring and the larger loop both lie in the same plane. If I increases, the
More informationPerforming Engineering Operations. Basic AC Theory Student Handout And Worksheet
Basic AC Theory Student Handout And Worksheet Legh Richardson Page 1 04/04/2011 Introduction to AC Voltage and Current DC Voltage and Current flows in one direction and is either positive or negative in
More informationInductors in AC Circuits
Inductors in AC Circuits Name Section Resistors, inductors, and capacitors all have the effect of modifying the size of the current in an AC circuit and the time at which the current reaches its maximum
More informationGeneral Physics for Engineering II PHYS 193 Final Exam Fall st January 2011
Qatar University Arts and Sciences College Mathematics and Physics Department General Physics for Engineering II PHYS 193 Final Exam Fall 2010 1 st January 2011 Student Name: ID Number: Please read the
More informationLaboratory 4 AC Circuits Phasors, Impedance and Transformers
Laboratory 4 AC Circuits Phasors, Impedance and Transformers Objectives The objectives of this laboratory are to gain practical understanding of circuits in the sinusoidal steady state and experience with
More informationPHYS2020: General Physics II Course Lecture Notes Section VI
PHYS2020: General Physics II Course Lecture Notes Section VI Dr. Donald G. Luttermoser East Tennessee State University Edition 4.0 Abstract These class notes are designed for use of the instructor and
More informationCh.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 informationPhys E1b The Physics of the Automotive Ignition System Spring 2008 I. INTRODUCTION
Phys E1b The Physics of the Automotive Ignition System Spring 2008 I. INTRODUCTION This laboratory exercise (1) explores the physics of automotive ignition systems used on vehicles for about half a century
More informationPHYSICS 120 : ELECTRICITY AND MAGNETISM TUTORIAL QUESTIONS. (ii) the maximum charge on the capacitor after a switch in the circuit is closed, and
RLC CIRCUITS Question 72 PHYSICS 120 : ELECTRICITY AND MAGNETISM TUTORIAL QUESTIONS Consider a series RC circuit for which R 2.0 10 6 Ω, C 6.0 ñf and E 20V. Find (i) the time constant of the circuit, (ii)
More informationEðlisfræði 2, vor 2007
[ Assignment View ] [ Print ] Eðlisfræði 2, vor 2007 30. Inductance Assignment is due at 2:00am on Wednesday, March 14, 2007 Credit for problems submitted late will decrease to 0% after the deadline has
More informationChap 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 informationECE 2006 Circuit Analysis Rev AC VOLTAGE AND CURRENT CALCULATIONS
10. AC CIRCUITS 2.1 AC VOLTAGE AND CURRENT CALCULATIONS 2.1.1 OBJECTIVE To study sinusoidal voltages and currents in order to understand frequency, period, effective value, instantaneous power and average
More informationAP 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 informationWeek 12  Alternating Current
Week 2  Alternating Current November 2, 202 The city lights of Prince George, British Columbia viewed in a motion blurred exposure. The AC blinking causes the lines to be dotted rather than continuous.
More informationLab #4 Capacitors and Inductors. Capacitor and Inductor Transient Response
Capacitor and Inductor Transient Response Capacitor Theory Like resistors, capacitors are also basic circuit elements. Capacitors come in a seemingly endless variety of shapes and sizes, and they can all
More informationChapter 13. RLC Circuits and Resonance. Objectives
Chapter 13 RLC Circuits and Resonance Objectives Determine the impedance of a series RLC circuit Analyze series RLC circuits Analyze a circuit for series resonance Analyze series resonant filters Analyze
More information1. Effective voltage is given by expression
Chapter 07 A C CIRCUITS 1. Effective voltage is given by expression 1) Ve = Vo/ 2 2) Ve = 2 Vo 3) Vo/π 4) π Vo Effective voltage isrms voltage Answer is (1) 2. A coil having zero resistance is connected
More informationAS91526: Demonstrate understanding of electrical systems Level 3 Credits 6
AS956: Demonstrate understanding of electrical systems Level 3 redits 6 This achievement standard involves demonstrating understanding of electrical systems. Achievement riteria Achievement Achievement
More informationPhysics 2102 Lecture 19. Physics 2102
Physics 2102 Jonathan Dowling Physics 2102 Lecture 19 Ch 30: Inductors and RL Circuits Nikolai Tesla What are we going to learn? A road map Electric charge Electric force on other electric charges Electric
More informationSTATEWIDE CAREER/TECHNICAL EDUCATION COURSE ARTICULATION REVIEW MINUTES
STATEWIDE CAREER/TECHNICAL EDUCATION COURSE ARTICULATION REVIEW MINUTES Articulation Agreement Identifier: ELM 201 (20111) Identifier is the postsecondary course prefix followed by PlanofInstruction
More informationAnalog Circuits. A (2) d. C = " r" o
Analog Circuits Introduction: Resistors, capacitors and inductors are commonly used components in analog circuits. In various combinations, they can be used to build frequency filters and oscillators.
More informationIntroduction to Inductance and Inductors. Online Resource for ETCH 213 Faculty: B. Allen
Introduction to Inductance and Inductors Selfinductance SelfInductance The property that causes a counterelectromotive force to be produced in a conductor when a magnetic field expands or collapses with
More information