Power lines. Why do birds sitting on a high-voltage power line survive?
|
|
- Gloria Gaines
- 6 years ago
- Views:
Transcription
1 Power lines At large distances, the resistance of power lines becomes significant. To transmit maximum power, is it better to transmit high V, low I or high I, low V? (a) high V, low I (b) low V, high I (c) makes no difference Power loss is I 2 R, so want to minimize current. Why do birds sitting on a high-voltage power line survive? They are not touching high and low potential simultaneously to form a circuit that can conduct current PHY2054: Chapter 18 18
2 Resistors Current flows through a light bulb. If a wire is now connected across the bulb as shown, what happens? (a) Bulb remains at same brightness (b) Bulb dims to 1/4 its former brightness (1/2 current) (c) Bulb goes out (d) None of the above The wire shunt has almost no resistance and it is in parallel with a bulb having resistance. Therefore voltage across shunt (and bulb ) is ~ 0. Thus almost all the current follows the zero (or extremely low) resistance path. PHY2054: Chapter 18 19
3 Circuits Two light bulbs A and B are connected in series to a constant voltage source. When a wire is connected across B, what will happen to bulb A? (a) burns more brightly than before (b) burns as brightly as before (c) burns more dimly than before (d) goes out The wire shunt effectively eliminates the second resistance, hence increasing the current in the circuit by 2x. The first bulb burns 4x brighter (I 2 R). PHY2054: Chapter 18 20
4 Series circuit Voltage Drops in Series Circuit Battery V, resistors R 1 and R 2 Current i = V / (R 1 + R 2 ) Voltage across R 1 = IR 1 = V * R 1 / (R 1 + R 2 ) Voltage across R 2 = IR 2 = V * R 2 / (R 1 + R 2 ) So voltage drops in proportion to resistance! Let V = 24, R 1 = 8Ω, R 2 = 4Ω V 1 = 24 * 8 / 12 = 16 V 1 = 24 * 4 / 12 = 8 Useful when considering how resistors divide up voltage PHY2054: Chapter 18 21
5 Circuits Consider the network of resistors shown below. When the switch S is closed, then: What happens to the voltage across R 1, R 2, R 3, R 4? What happens to the current through R 1, R 2, R 3, R 4? What happens to the total power output of the battery? Let R 1 = R 2 = R 3 = R 4 = 90 Ω and V = 45 V. Find the current through each resistor before and after closing the switch. Before I 1 = 45/135 = 1/3 I 2 = 0 I 3 = I 4 = 15/90=1/6 After I 1 = 45/120 = 3/8 I 2 = I 3 = I 4 = 1/8 PHY2054: Chapter 18 22
6 Circuits The light bulbs in the circuits below are identical. Which configuration produces more light? (a) circuit I (b) circuit II (c) both the same Circuit II has ½ current of each branch of circuit I, so each bulb is ¼ as bright. The total light in circuit I is thus 4x that of circuit II. PHY2054: Chapter 18 23
7 Circuits The three light bulbs in the circuit are identical. The current flowing through bulb B, compared to the current flowing through bulb A, is a) 4 times as much b) twice as much c) the same d) half as much e) 1/4 as much Branch of circuit A has ½ resistance, thus it has 2x current. PHY2054: Chapter 18 24
8 Circuits The three light bulbs in the circuit are identical. What is the brightness of bulb B compared to bulb A? a) 4 times as much b) twice as much c) the same d) half as much e) 1/4 as much Use P = I 2 R. Thus 2x current in A means it is 4x brighter. PHY2054: Chapter 18 25
9 More Complicated Circuits Parallel and series rules are not enough! Use Kirchoff s rules PHY2054: Chapter 18 26
10 Problem Solving Using Kirchhoff s Rules Label the current in each branch of the circuit Choice of direction is arbitrary (signs work out in the end) Apply junction rule at each junction: I = I 1 + I 2 I Apply loop rule to each loop (follow in one direction) Resistors: if loop direction in current direction, voltage drop Batteries: if loop direction in normal direction, voltage gain Sum of all voltages = 0 around loop I +V - IR Solve equations simultaneously You need as many equations as you have unknowns I 1 I 2 See example next slide PHY2054: Chapter 18 27
11 Example 1: Applying Kirchhoff s Rules Determine magnitudes and directions of all currents Take two loops, 1 and 2, as shown Choose currents & directions!: I 1, I 2, I 3 Use I 1 = I 2 + I 3 I 3 9 V 15 Ω 22 Ω 2 I I = 0 22I I = V I 1 1 I 1 I I 2 3 = 15/ 22 = 0.68 = 6/15 = 0.40 I = I + I = PHY2054: Chapter 18 28
12 Example 2: Applying Kirchhoff s Rules Pick currents as shown I 3 = I 1 + I I I = I 2I = I I 1 2 = 2 = 3 I = I + I = PHY2054: Chapter 18 29
13 Circuits Which of the equations is valid for the circuit loop below? a) 2 I 1 2I 2 = 0 b) 2 2I 1 2I 2 4I 3 = 0 c) 2 I 1 4 2I 2 = 0 d) I 3 2I 2 4I 3 = 0 e) 2 2I 1 2I 2 4I 3 = 0 PHY2054: Chapter 18 30
14 Circuit Problem (1) The light bulbs in the circuit are identical. What happens when the switch is closed? a) both bulbs go out b) the intensity of both bulbs increases c) the intensity of both bulbs decreases d) nothing changes Before: Potential at (a) is 12V, but so is potential at (b) because equal resistance divides 24V in half. When the switch is closed, nothing will change since (a) and (b) are still at same potential. (a) (b) PHY2054: Chapter 18 31
15 Circuit Problem (2) The light bulbs in the circuit shown below are identical. When the switch is closed, what happens to the intensity of the light bulbs? a) bulb A increases b) bulb A decreases c) bulb B increases d) bulb B decreases e) nothing changes (a) (b) Before: Potential at (a) is 12V, but so is potential at (b) because equal resistance divides 24V in half. When the switch is closed, nothing will change since (a) and (b) are still at same potential. PHY2054: Chapter 18 32
16 Circuit Problem (3) The bulbs A and B have the same R. What happens when the switch is closed? a) nothing happens b) A gets brighter, B dimmer c) B gets brighter, A dimmer d) both go out (a) (b) Before: Bulb A and bulb B both have 18V across them. 24V After: Bulb A has 12V across it and bulb B has 24V across it (these potentials are forced by the batteries). PHY2054: Chapter 18 33
Circuits. PHY2054: Chapter 18 1
Circuits PHY2054: Chapter 18 1 What You Already Know Microscopic nature of current Drift speed and current Ohm s law Resistivity Calculating resistance from resistivity Power in electric circuits PHY2054:
More informationAgenda for Today. Elements of Physics II. Resistance Resistors Series Parallel Ohm s law Electric Circuits. Current Kirchoff s laws
Resistance Resistors Series Parallel Ohm s law Electric Circuits Physics 132: Lecture e 17 Elements of Physics II Current Kirchoff s laws Agenda for Today Physics 201: Lecture 1, Pg 1 Clicker Question
More informationClicker Session Currents, DC Circuits
Clicker Session Currents, DC Circuits Wires A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance? 1) it decreases
More informationParallel Resistors (32.6)
Parallel Resistors (32.6) Resistors connected at both ends are called parallel resistors The important thing to note is that: the two left ends of the resistors are at the same potential. Also, the two
More informationParallel Resistors (32.6)
Parallel Resistors (32.6) Resistors connected at both ends are called parallel resistors Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring 2010 1 / 1 Parallel Resistors (32.6)
More informationConcepTest PowerPoints
ConcepTest PowerPoints Chapter 19 Physics: Principles with Applications, 6 th edition Giancoli 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for
More informationConcepTest Clicker Questions. Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli
ConcepTest Clicker Questions Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli 2008 Pearson Education, Inc. This work is protected by United States copyright laws
More informationDC Circuits. Electromotive Force Resistor Circuits. Kirchoff s Rules. RC Circuits. Connections in parallel and series. Complex circuits made easy
DC Circuits Electromotive Force esistor Circuits Connections in parallel and series Kirchoff s ules Complex circuits made easy C Circuits Charging and discharging Electromotive Force (EMF) EMF, E, is the
More information1. A1, B3 2. A1, B2 3. A3, B2 4. A2, B2 5. A3, B3 6. A1, B1 7. A2, B1 8. A2, B3 9. A3, B1
peden (jp5559) Time onstants peden (0100) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Test is Thursday!
More informationIntroduction. Pre-lab questions: Physics 1BL KIRCHOFF S RULES Winter 2010
Introduction In this lab we will examine more complicated circuits. First, you will derive an expression for equivalent resistance using Kirchhoff s Rules. Then you will discuss the physics underlying
More informationOutline. Week 5: Circuits. Course Notes: 3.5. Goals: Use linear algebra to determine voltage drops and branch currents.
Outline Week 5: Circuits Course Notes: 3.5 Goals: Use linear algebra to determine voltage drops and branch currents. Components in Resistor Networks voltage source current source resistor Components in
More informationΔV of battery. = ε - Ir or εmf = I(R+r) (for this particular series circuit) March 04, Emf and internal resistance. Emf and internal resistance
Emf and internal resistance Emf and internal resistance ΔV of battery = ε - Ir or εmf = I(R+r) (for this particular series circuit) As the current in the circuit increases the voltage, supplied to the
More informationChapter 19. Electric Current, Resistance, and DC Circuit Analysis
Chapter 19 Electric Current, Resistance, and DC Circuit Analysis I = dq/dt Current is charge per time SI Units: Coulombs/Second = Amps Direction of Electron Flow _ + Direction of Conventional Current:
More informationPHYS 1444 Section 003 Lecture #12
PHYS 1444 Section 003 Lecture #12 Monday, Oct. 10, 2005 EMF and Terminal Voltage Resisters in series and parallel Kirchhoff s Rules EMFs in series and parallel RC Circuits Today s homework is homework
More information52 VOLTAGE, CURRENT, RESISTANCE, AND POWER
52 VOLTAGE, CURRENT, RESISTANCE, AND POWER 1. What is voltage, and what are its units? 2. What are some other possible terms for voltage? 3. Batteries create a potential difference. The potential/voltage
More informationPHYS 1444 Section 02 Review #2
PHYS 1444 Section 02 Review #2 November 9, 2011 Ian Howley 1 1444 Test 2 Eq. Sheet Terminal voltage Resistors in series Resistors in parallel Magnetic field from long straight wire Ampére s Law Force on
More information4 Electric circuits. Serial and parallel resistors V 3 V 2 V Serial connection of resistors:
4 lectric circuits PHY67 Spring 006 Serial and parallel resistors Serial connection of resistors: As the current I through each of serially connected resistors is the same, one can use Ohm s law and write...
More informationChapter 19 Lecture Notes
Chapter 19 Lecture Notes Physics 2424 - Strauss Formulas: R S = R 1 + R 2 +... C P = C 1 + C 2 +... 1/R P = 1/R 1 + 1/R 2 +... 1/C S = 1/C 1 + 1/C 2 +... q = q 0 [1-e -t/(rc) ] q = q 0 e -t/(rc τ = RC
More informationSeries and Parallel. How we wire the world
Series and Parallel How we wire the world Series vs Parallel Circuits Series Circuit Electrons only have one path to flow through. Parallel Circuit There are MULTIPLE paths for the current to flow through.
More informationphysics 4/7/2016 Chapter 31 Lecture Chapter 31 Fundamentals of Circuits Chapter 31 Preview a strategic approach THIRD EDITION
Chapter 31 Lecture physics FOR SCIENTISTS AND ENGINEERS a strategic approach THIRD EDITION randall d. knight Chapter 31 Fundamentals of Circuits Chapter Goal: To understand the fundamental physical principles
More informationObjectives. to understand qualitatively current flow through circuit elements connected in series and parallel
UNIT 8 DIRECT CURRENT CIRCUITS: CURRENT (from Lillian C. McDermott and the Physics Education Group, Physics by Inquiry Volume II, John Wiley and Sons, NY, 1996) Objectives to understand qualitatively current
More informationDirect-Current Circuits. Physics 231 Lecture 6-1
Direct-Current Circuits Physics 231 Lecture 6-1 esistors in Series and Parallel As with capacitors, resistors are often in series and parallel configurations in circuits Series Parallel The question then
More informationCURRENT SOURCES EXAMPLE 1 Find the source voltage Vs and the current I1 for the circuit shown below SOURCE CONVERSIONS
CURRENT SOURCES EXAMPLE 1 Find the source voltage Vs and the current I1 for the circuit shown below EXAMPLE 2 Find the source voltage Vs and the current I1 for the circuit shown below SOURCE CONVERSIONS
More informationPHYSICS 171. Experiment 3. Kirchhoff's Laws. Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm).
PHYSICS 171 Experiment 3 Kirchhoff's Laws Equipment: Supplies: Digital Multimeter, Power Supply (0-20 V.). Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm). A. Kirchhoff's Loop Law Suppose that
More informationMasteringPhysics: Assignment Print View. Problem 30.50
Page 1 of 15 Assignment Display Mode: View Printable Answers phy260s08 homework 13 Due at 11:00pm on Wednesday, May 14, 2008 View Grading Details Problem 3050 Description: A 15-cm-long nichrome wire is
More informationChapter 26 Direct-Current Circuits
Chapter 26 Direct-Current Circuits 1 Resistors in Series and Parallel In this chapter we introduce the reduction of resistor networks into an equivalent resistor R eq. We also develop a method for analyzing
More informationPhysics Circuits: Series
FACULTY OF EDUCATION Department of Curriculum and Pedagogy Physics Circuits: Series Science and Mathematics Education Research Group Supported by UBC Teaching and Learning Enhancement Fund 2012-2013 Series
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Circuit Analysis Simple electric circuits may contain batteries, resistors, and capacitors in various combinations. For some circuits, analysis may consist of combining
More information5. In parallel V 1 = V 2. Q 1 = C 1 V 1 and Q 2 = C 2 V 2 so Q 1 /Q 2 = C 1 /C 2 = 1.5 D
NSWRS - P Physics Multiple hoice Practice ircuits Solution nswer 1. The resistances are as follows: I:, II: 4, III: 1, IV:. The total resistance of the 3 and 6 in parallel is making the total circuit resistance
More informationCurrent. I = ei e = en e Av d. The current, which is Coulomb s per second, is simply
Current The current, which is Coulomb s per second, is simply I = ei e = en e Av d e is the charge is the electron! ne is the density of electrons! A is the cross sectional area of the wire! vd is the
More information10/14/2018. Current. Current. QuickCheck 30.3
Current If QCurrent is the total amount of charge that has moved past a point in a wire, we define the current I in the wire to be the rate of charge flow: The SI unit for current is the coulomb per second,
More informationCircuit 3. Name Student ID
Name Student ID last first Score II. [10 pts total] The following questions are based on your experience in the lab. The questions are not related to each other. Please assume that all batteries are ideal
More informationPhysics 2020 Lab 5 Intro to Circuits
Physics 2020 Lab 5 Intro to Circuits Name Section Tues Wed Thu 8am 10am 12pm 2pm 4pm Introduction In this lab, we will be using The Circuit Construction Kit (CCK). CCK is a computer simulation that allows
More informationConcepTest PowerPoints
ConcepTest PowerPoints Chapter 16 Physics: Principles with Applications, 7 th edition Giancoli 2014 Pearson Education, Inc. This work is protected by United States copyright laws and is provided solely
More informationPOWER B. Terms: EMF, terminal voltage, internal resistance, load resistance. How to add up resistors in series and parallel: light bulb problems.
iclicker Quiz (1) I have completed at least 50% of the reading and study-guide assignments associated with the lecture, as indicated on the course schedule. A. True B. False Hint: this is a good time to
More informationLecture 12 Chapter 28 RC Circuits Course website:
Lecture 12 Chapter 28 RC Circuits Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Today we are going to discuss: Chapter 28: Section 28.9 RC circuits Steady current Time-varying
More informationElectricity & Magnetism
Electricity & Magnetism D.C. Circuits Marline Kurishingal Note : This chapter includes only D.C. In AS syllabus A.C is not included. Recap... Electrical Circuit Symbols : Draw and interpret circuit diagrams
More informationBROCK UNIVERSITY. Name: Student #: Page 1 of 8
Name: Student #: BROCK UNIVERSITY Page 1 of 8 Mid-term Test 2: March 2010 Number of pages: 8 Course: PHYS 1P22/1P92 Number of students: 125 Examination date: 19 March 2010 Number of hours: 2 Time of Examination:
More informationDirect Current Circuits. February 18, 2014 Physics for Scientists & Engineers 2, Chapter 26 1
Direct Current Circuits February 18, 2014 Physics for Scientists & Engineers 2, Chapter 26 1 Kirchhoff s Junction Rule! The sum of the currents entering a junction must equal the sum of the currents leaving
More informationPhysics 102: Lecture 06 Kirchhoff s Laws
Physics 102: Lecture 06 Kirchhoff s Laws Physics 102: Lecture 6, Slide 1 Today Last Lecture Last Time Resistors in series: R eq = R 1 R 2 R 3 Current through each is same; Voltage drop is IR i Resistors
More informationRC Circuits. Lecture 13. Chapter 31. Physics II. Course website:
Lecture 13 Chapter 31 Physics II RC Circuits Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Lecture Capture: http://echo360.uml.edu/danylov201415/physics2spring.html Steady current
More informationLecture 11. Power in Electric Circuits, Kirchhoff s Rules
Lecture 11. Power in Electric Circuits, Kirchhoff s Rules Outline: Energy and power in electric circuits. Voltage and Current Sources. Kirchhoff s Rules. Lecture 10: Connection of resistors in parallel
More informationT U T O R I A L : A M O D E L F O R C I R C U I T S
South Pasadena Physics Name 10 Circuits Period Date T U T O R I A L : A M O D E L F O R C I R C U I T S Tutorial Instructions This Tutorial contains Activities and Exercises. Activities: These are intended
More informationPhysics 212. Lecture 11. RC Circuits. Change in schedule Exam 2 will be on Thursday, July 12 from 8 9:30 AM. Physics 212 Lecture 11, Slide 1
Physics 212 Lecture 11 ircuits hange in schedule Exam 2 will be on Thursday, July 12 from 8 9:30 AM. Physics 212 Lecture 11, Slide 1 ircuit harging apacitor uncharged, switch is moved to position a Kirchoff
More informationPHY232 Spring 2008 Jon Pumplin (Original ppt courtesy of Remco Zegers) Direct current Circuits
PHY232 Spring 2008 Jon Pumplin http://www.pa.msu.edu/~pumplin/phy232 (Original ppt courtesy of Remco Zegers) Direct current Circuits So far, we have looked at systems with only one resistor PHY232 Spring
More informationPhysics 9 Monday, April 7, 2014
Physics 9 Monday, April 7, 2014 Handing out HW11 today, due Friday. Finishes induced emf; starts circuits. For today: concepts half of Ch31 (electric circuits); read equations half for Wednesday. Annotated
More informationLab 8 Simple Electric Circuits
Lab 8 Simple Electric Circuits INTRODUCTION When we talk about the current in a river, we are referring to the flow of water. Similarly, when we refer to the electric current in a circuit, we are talking
More information7th Grade Task for today:
7th Grade Task for today: Complete the Magnetism and Electricity task sheet. Be sure to complete both sides Use pages 654-677 for Magnetism Use pages 682-717 for Electricity 1. How do magnec poles interact?
More informationLABORATORY 4 ELECTRIC CIRCUITS I. Objectives
LABORATORY 4 ELECTRIC CIRCUITS I Objectives to be able to discuss potential difference and current in a circuit in terms of electric field, work per unit charge and motion of charges to understand that
More informationChapter 26 Direct-Current Circuits
Chapter 26 Direct-Current Circuits 1 Resistors in Series and Parallel In this chapter we introduce the reduction of resistor networks into an equivalent resistor R eq. We also develop a method for analyzing
More informationCapacitance. A different kind of capacitor: Work must be done to charge a capacitor. Capacitors in circuits. Capacitor connected to a battery
Capacitance The ratio C = Q/V is a conductor s self capacitance Units of capacitance: Coulomb/Volt = Farad A capacitor is made of two conductors with equal but opposite charge Capacitance depends on shape
More informationChapter 28: DC and RC Circuits Kirchhoff s Rules
Chapter 28: DC and RC Circuits Kirchhoff s Rules Series Circuits The current is the same in each device. The equivalent resistance of the circuit is the sum of the individual resistances. Parallel Circuits
More informationSierzega: DC Circuits 4 Searching for Patterns in Series and Parallel Circuits
Searching for Series and Parallel Circuits. Observe and Design Draw circuit diagrams according to the word descriptions below. Build the circuits and use the symbols to represent the battery and the light
More informationIn this unit, we will examine the movement of electrons, which we call CURRENT ELECTRICITY.
Recall: Chemistry and the Atom! What are the 3 subatomic Where are they found in the particles? atom? What electric charges do they have? How was a positive ion created? How was a negative ion created?
More informationPhysics 115. General Physics II. Session 24 Circuits Series and parallel R Meters Kirchoff s Rules
Physics 115 General Physics II Session 24 Circuits Series and parallel R Meters Kirchoff s Rules R. J. Wilkes Email: phy115a@u.washington.edu Home page: http://courses.washington.edu/phy115a/ 5/15/14 Phys
More informationPHYS 1102 EXAM - II. SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) You have 1 hr 45 minutes to complete the test
PHYS 1102 EXAM - II SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) Your Name: Student ID: You have 1 hr 45 minutes to complete the test PLEASE DO NOT START TILL YOU ARE INSTRUCTED
More informationPhysics 1402: Lecture 10 Today s Agenda
Physics 1402: Lecture 10 Today s Agenda Announcements: Lectures posted on: www.phys.uconn.edu/~rcote/ HW assignments, solutions etc. Homework #3: On Masterphysics : due Friday at 8:00 AM Go to masteringphysics.com
More informationUniversity of Maryland Department of Physics
Spring 2002 University of Maryland Department of Physics Laura Lising Physics 122 March 20, 2003 Exam #1 Make-up Multiple choice questions. 1) (7 pts.) In one lecture demonstration I had the Van de Graaf
More informationPhysics Tutorial - Currents and Circuits
Question 1: Ion Channels Physics Tutorial - Currents and Circuits The biochemistry that takes place inside cells depends on various elements that are dissolved in water as ions. The ions enter cells through
More information9. Which of the following is the correct relationship among power, current, and voltage?. a. P = I/V c. P = I x V b. V = P x I d.
Name: Electricity and Magnetism Test Multiple Choice Identify the choice that best completes the statement. 1. Resistance is measured in a unit called the. a. ohm c. ampere b. coulomb d. volt 2. The statement
More informationSyllabus and Course Overview!
Electronics Lab! Syllabus and Course Overview! oltage Current and Ohm s Law! Kirchoff s Laws! The oltage Divider! Syllabus and Course Overview! n http://www.stlawu.edu/academics/programs/physics! oltage,
More informationChapter 21 Electric Current and Direct- Current Circuits
Chapter 21 Electric Current and Direct- Current Circuits 1 Overview of Chapter 21 Electric Current and Resistance Energy and Power in Electric Circuits Resistors in Series and Parallel Kirchhoff s Rules
More informationCourse Updates.
Course Updates http://www.phys.hawaii.edu/~varner/phys272-spr10/physics272.html Notes for today: 1) Chapter 26 this week (DC, C circuits) 2) Assignment 6 (Mastering Physics) online and separate, written
More informationActivity 4: The Electric-Circuit Interaction
RECORD SHEET Activity 4: The Electric-Circuit Interaction Name Date Class Key Questions 1. 2. Explore Your Ideas Experiment 1: When does an electric-circuit interaction occur? 1. Draw a picture of the
More informationTactics Box 23.1 Using Kirchhoff's Loop Law
PH203 Chapter 23 solutions Tactics Box 231 Using Kirchhoff's Loop Law Description: Knight/Jones/Field Tactics Box 231 Using Kirchhoff s loop law is illustrated Learning Goal: To practice Tactics Box 231
More informationLecture #3. Review: Power
Lecture #3 OUTLINE Power calculations Circuit elements Voltage and current sources Electrical resistance (Ohm s law) Kirchhoff s laws Reading Chapter 2 Lecture 3, Slide 1 Review: Power If an element is
More informationFor an electric current to flow between two points, two conditions must be met.
ELECTROSTATICS LAB Electric Circuits For an electric current to flow between two points, two conditions must be met. 1. There must be a conducting path between the points along which the charges can move.
More informationPRACTICE EXAM 1 for Midterm 2
PRACTICE EXAM 1 for Midterm 2 Multiple Choice Questions 1) The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. What happens to the brightness
More informationUNIVERSITY OF ALABAMA Department of Physics and Astronomy. PH / LeClair Fall Circuits Exercises
UNIVERSITY OF ALABAMA Department of Physics and Astronomy PH 106-4 / LeClair Fall 008 Circuits Exercises 1. Are the two headlights of a car wired in series or in parallel? How can you tell? Have you ever
More informationNote-A-Rific: Kirchhoff s
Note-A-Rific: Kirchhoff s We sometimes encounter a circuit that is too complicated for simple analysis. Maybe there is a mix of series and parallel, or more than one power source. To deal with such complicated
More informationPhysics 102 Spring 2007: Final Exam Multiple-Choice Questions
Last Name: First Name: Physics 102 Spring 2007: Final Exam Multiple-Choice Questions 1. The circuit on the left in the figure below contains a battery of potential V and a variable resistor R V. The circuit
More informationExam 3--PHYS 102--S14
Name: Exam 3--PHYS 102--S14 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of these statements is always true? a. resistors in parallel have the
More informationElectric Charge and Electric field
Electric Charge and Electric field ConcepTest 16.1a Electric Charge I Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges? 1) one is positive,
More informationChapter 18 Electric Currents
Chapter 18 Electric Currents 1 The Electric Battery Volta discovered that electricity could be created if dissimilar metals were connected by a conductive solution called an electrolyte. This is a simple
More informationThe next two questions pertain to the situation described below. Consider a parallel plate capacitor with separation d:
PHYS 102 Exams Exam 2 PRINT (A) The next two questions pertain to the situation described below. Consider a parallel plate capacitor with separation d: It is connected to a battery with constant emf V.
More informationVersion 001 CIRCUITS holland (1290) 1
Version CIRCUITS holland (9) This print-out should have questions Multiple-choice questions may continue on the next column or page find all choices before answering AP M 99 MC points The power dissipated
More informationphysics for you February 11 Page 68
urrent Electricity Passage 1 4. f the resistance of a 1 m length of a given wire t is observed that good conductors of heat are also is 8.13 10 3 W, and it carried a current 1, the good conductors of electricity.
More informationAP1 Electricity. 1. A student wearing shoes stands on a tile floor. The students shoes do not fall into the tile floor due to
1. A student wearing shoes stands on a tile floor. The students shoes do not fall into the tile floor due to (A) a force of repulsion between the shoes and the floor due to macroscopic gravitational forces.
More informationLab 4. Current, Voltage, and the Circuit Construction Kit
Physics 2020, Spring 2009 Lab 4 Page 1 of 8 Your name: Lab section: M Tu Wed Th F TA name: 8 10 12 2 4 Lab 4. Current, Voltage, and the Circuit Construction Kit The Circuit Construction Kit (CCK) is a
More informationR R V I R. Conventional Current. Ohms Law V = IR
DC Circuits opics EMF and erminal oltage esistors in Series and in Parallel Kirchhoff s ules EMFs in Series and in Parallel Capacitors in Series and in Parallel Ammeters and oltmeters Conventional Current
More informationUniversity of Maryland Department of Physics
Spring 3 University of Maryland Department of Physics Laura Lising Physics 1 March 6, 3 Exam #1 nswer all questions on these sheets. Please write clearly and neatly: We can only give you credit for what
More informationCHAPTER 16,18,19 TEST REVIEW
AP PHYSICS Name: Period: Date: Points: 58 Score: IB Curve: DEVIL PHYSICS BADDEST CLASS ON CAMPUS 50 Multiple Choice 45 Single Response 5 Multi-Response Free Response 3 Short Free Response 2 Long Free Response
More informationweek 6 chapter 31 Current and Resistance
week 6 chapter 31 Current and Resistance Which is the correct way to light the lightbulb with the battery? 4) all are correct 5) none are correct 1) 2) 3) Which is the correct way to light the lightbulb
More informationLab 3 Parallel Circuits
Lab 3 Parallel Circuits!!! RED THIS PGE!!!! When a wire or light bulb is connected across a battery, we have evidence that something is happening in the circuit. The wire gets warm. The bulb glows. In
More informationElectricity & Magnetism Lecture 10: Kirchhoff s Rules
Electricity & Magnetism Lecture 10: Kirchhoff s Rules Today s Concept: Kirchhoff s Rules Electricity & Magne
More informationNow let s look at some devices that don t have a constant resistance.
Lab #3 Now let s look at some devices that don t have a constant resistance. This is the same circuit you built last time. But now, in place of the resistor first build the circuit with a light bulb, then
More informationYour Comments. THIS IS SOOOO HARD. I get the concept and mathematical expression. But I do not get links among everything.
Your omments THIS IS SOOOO HAD. I get the concept and mathematical expression. But I do not get links among everything. ery confusing prelecture especially what happens when switches are closed/opened
More informationElectromagnetism Review Sheet
Electromagnetism Review Sheet Electricity Atomic basics: Particle name Charge location protons electrons neutrons + in the nucleus - outside of the nucleus neutral in the nucleus What would happen if two
More informationM. C. Escher: Waterfall. 18/9/2015 [tsl425 1/29]
M. C. Escher: Waterfall 18/9/2015 [tsl425 1/29] Direct Current Circuit Consider a wire with resistance R = ρl/a connected to a battery. Resistor rule: In the direction of I across a resistor with resistance
More informationParallel Circuits. Chapter
Chapter 5 Parallel Circuits Topics Covered in Chapter 5 5-1: The Applied Voltage V A Is the Same Across Parallel Branches 5-2: Each Branch I Equals V A / R 5-3: Kirchhoff s Current Law (KCL) 5-4: Resistance
More informationLaboratory 7: Charging and Discharging a Capacitor Prelab
Phys 132L Fall 2018 Laboratory 7: Charging and Discharging a Capacitor Prelab Consider a capacitor with capacitance C connected in series to a resistor with resistance R as shown in Fig. 1. Theory predicts
More informationChapter 28 Direct Current Circuits
Chapter 28 Direct Current Circuits Multiple Choice 1. t what rate is thermal energy being generated in the 2-resistor when = 12 V and = 3.0 Ω? 2 a. 12 W b. 24 W c. 6.0 W d. 3.0 W e. 1.5 W 2. t what rate
More informationProtons = Charge Electrons = Charge Neutrons = Charge. When Protons = Electrons, atoms are said to be ELECTRICALLY NEUTRAL (no net charge)
QUICK WRITE: For 2 minutes, write the three parts of an atom and what their charges are. Explain what creates an electric charge (positive or negative) on something. Rules - You MUST write for the entire
More informationName: Block: Date: NNHS Introductory Physics: MCAS Review Packet #4 Introductory Physics, High School Learning Standards for a Full First-Year Course
Introductory Physics, High School Learning Standards for a Full First-Year Course I. C ONTENT S TANDARDS electricity and magnetism. 5.1 Recognize that an electric charge tends to be static on insulators
More informationChapter 6 DIRECT CURRENT CIRCUITS. Recommended Problems: 6,9,11,13,14,15,16,19,20,21,24,25,26,28,29,30,31,33,37,68,71.
Chapter 6 DRECT CURRENT CRCUTS Recommended Problems: 6,9,,3,4,5,6,9,0,,4,5,6,8,9,30,3,33,37,68,7. RESSTORS N SERES AND N PARALLEL - N SERES When two resistors are connected together as shown we said that
More informationResistance, Ohm s Law and Kirchoff s Laws
Universiti Teknologi MR Fakulti Sains Gunaan Resistance, Ohm s Law and Kirchoff s Laws PHY631: Physical Science ctivity Name: HP: Lab#: Intro Objectives The goal of today s activity is to physically investigate
More informationSPS Presents: A Cosmic Lunch!
SPS Presents: A Cosmic Lunch! Who: Dr. Brown will be speaking about Evolution of the Elements: from Periodic table to Standard Model and Beyond! When: October 7 th at am Where: CP 79 (by the front office)
More informationGr. 11 Physics Electricity
Gr. 11 Physics Electricity This chart contains a complete list of the lessons and homework for Gr. 11 Physics. Please complete all the worksheets and problems listed under Homework before the next class.
More informationCurrent Electricity. ScienceLinks 9, Unit 4 SciencePower 9, Unit 3
Current Electricity ScienceLinks 9, Unit 4 SciencePower 9, Unit 3 Current Electricity The flow of negative charges (electrons) through conductors Watch the BrainPOPs: Electricity Current Electricity Activity:
More informationCh 28-DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V. V =! " Ir. Terminal Open circuit internal! voltage voltage (emf) resistance" 2.
Ch 28-DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V V =! " Ir Terminal Open circuit internal! voltage voltage (emf) resistance" 2.) Resistors in series! One of the bits of nastiness about
More information