Now let s look at some devices that don t have a constant resistance.


 Martin Lewis
 3 years ago
 Views:
Transcription
1 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 a photoresistor, and finally a thremistor. 3.1) Build the same circuit you built in the last lab but this time replace the resistor with a light bulb. Make another plot of the current verses the voltage. Make at least 5 measurements between 0 and 3 Volts. Don t worry if the light bulb doesn t come on for the low voltage measurements. You will still get good data points. Do not exceed 10 Volts on the power supply. Does your plot look like the plot for the resistor? How is it different? Your curve will not be a straight line because the resistance of the filament in the light bulb depends on how much current is flowing through it and the temperature of the filament. 3.2) A photoresistor is like the resistor you used in Lab #1 but the material it is made of is sensitive to ambient light levels. The resistance of the photoresistor will change as the light levels change. Replace the light bulb in your circuit with a photoresistor and set the voltage on your power supply at 5 Volts. What is the current? Now cover the photoresistor with something that will make it dark. What do you measure for the current now? Now try
2 shining a flashlight on the photoresistor and measuring the current. What is the current now? Determining how the photoresistor responds to specific light levels is called calibration. When you begin testing the packages you build for the balloon you will have to calibrate the instruments. 3.3) A thermistor is device that is similar to a photoresistor, but it is sensitive to temperature. The resistance of a thermistor will change with ambient temperature. Replace the photoresistor with a thermistor and keep the power supply at 5 Volts. What current do you measure? This is the response at room temperature (approximately 70 F). Hold the thermistor between your fingers and watch the current measurement change as the thermistor warms up to your body temperature. Note the current when the value stops changing, this is a reading for a temperature of about 98 F. Now use some of the cold spray to cool the thermistor. What is the current when the ice just begins to melt? This corresponds to approximately 32 F. You can create a calibration curve for the thermistor by plotting the current on the y axis and temperature on the x axis. If you were going to use this to make temperature reading you would need more than three points though. What is the reason for this? If you had only made three measurements when the light bulb was in the circuit would you have plotted a accurate curve in section 3.1? Series verse Parallel Circuits 3.4) Every circuit you have made so far has only had one component. Now we are going to look at what happens when you have multiple components in a circuit. Connect a single light bulb to the power supply set to 5 Volts. Note how bright the light bulb is and measure the current running through the light bulb with the multimeter. Make the following table. V bulb I bulb The brightness of a light bulb is related to how much current is flowing through it.
3 3.5) Now connect two light bulbs and the power supply together like Figure 2a. This circuit is 2 light bulbs wired in series. How does the brightness of the two light bulbs compare to each other? Is the current used up Figure by the 2a first light bulb? Figure 2b What happens when you unscrew one of the light bulbs? How does the brightness of the bulbs compare to when a single light bulb was connected to the battery? How does the amount of current through the 2 bulbs in series in compare to the current through a single bulb? Measure the current running through the circuit with the multimeter. How does it compare to when only one light bulb was connected to the power supply? Measure the voltage across both bulbs. Now measure the voltage across each bulb individually and make a table like the one below. How is the voltage across a single light bulb related to the total voltage? Is it a function of the number of light bulbs? V both bulbs V bulb 1 V bulb 2 I circuit Formulate a rule for how the current relates to the number of light bulbs in series in comparison to a single bulb circuit. Formulate a rule for how the voltage across is single bulb relates to the number of light bulbs in series. 3.6) Now connect two light bulbs and the power supply together like in Figure 3. This circuit is 2 light bulbs wired in parallel. Figure 3
4 What Figure happens 4a when you unscrew one Figure of the 4b light bulbs? Figure 4c How does the brightness of the light bulbs compare to each other? To the light bulb in a single light bulb circuit? To the light bulbs in the series circuit? What happens when you unscrew a lightbulb? Measure the current in the 3 positions shown in Figures 4a, 4b, and 4c making a table like the one below. How do the measured currents compare? V power supply V bulb 1 V bulb 2 I junction I bulb1 I bulb 2 Is the ratio of the current you measure in 4a to the current in 4b related to the number of light bulbs? What happens to the current when it hits the junction point where the 2 light bulbs are connected to each other? What is the voltage across each lightbulb? Formulate a rule for how the current relates to the number of light bulbs in parallel. Ohm s Law for parallel and series circuits 3.7) In Lab #2 we learned that the voltage from the power supply (V) is equal to the current through the circuit (I) times the resistance of the circuit (R), in this case either a single light bulb or multiple light bulbs. Now let s figure out how to determine the resistance of the circuits above. If the current you measured in for Figure 2b is half the current when a single light bulb is in the circuit but the potential is the same, how much does the resistance of the total circuit increase by?
5 When resistors are in series, the resistance of all the resistors combined is equal to R total = R 1 + R 2 + R 3 +. (1) and the voltage across each component in series adds to the total voltage supplied by the power supply V total = V 1 + V 2 + V 3 +. (2) 3.8) If the current you measured in for Figure 4a is twice the current when a single light bulb is in the circuit but the voltage is the same, how much does the resistance of the total circuit decrease by? When resistors are in parallel, the resistance of all the resistors combined is equal to = (3) R total R 1 R 2 R 3 and the voltage across each component is equal to the voltage supplied by the power supply V total = V 1 = V 2 = V 3 (4) Voltage dividers 3.9) When people put a collection of instruments on a satellite, balloon, or rocket, not all the instruments will need the same input voltage. But weight limitations mean that only one set of batteries and thus one voltage will be available. You can use what we learned in sections 3.4 and 3.5 to combine resistors in series and create different voltages from a single voltage supply. This circuit is called a voltage divider. Pick 2 resistors and build the circuit in Figure 5. We can use formulas 1 and 2 to determine that the output voltage is V out = V in * R 2 R + R 1 2 (5) Confirm this with a couple different sets of resistors. Figure 5
Resistance Learning Outcomes
Resistance Learning Outcomes Define resistance and give its unit. Solve problems about resistance. State Ohm s Law. HL: Derive the formulas for resistors in series and parallel. Solve problems about resistors
More informationResistance Learning Outcomes. Resistance Learning Outcomes. Resistance
Resistance Learning Outcomes Define resistance and give its unit. Solve problems about resistance. State Ohm s Law. HL: Derive the formulas for resistors in series and parallel. Solve problems about resistors
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 informationNORTHERN ILLINOIS UNIVERSITY PHYSICS DEPARTMENT. Physics 211 E&M and Quantum Physics Spring Lab #4: Electronic Circuits I
NORTHERN ILLINOIS UNIVERSITY PHYSICS DEPARTMENT Physics 211 E&M and Quantum Physics Spring 2018 Lab #4: Electronic Circuits I Lab Writeup Due: Mon/Wed/Thu/Fri, Feb. 12/14/15/16, 2018 Background The concepts
More informationMaterials Needed 1 DCell battery 6 6inch pieces of wire 3 flashlight light bulbs 3 light bulb holders (optional)
Experiment Module 3 Electric Circuits Objective/Introduction This experiment explores building simple circuits and testing Ohm s Law. Students will start lighting a simple light bulb. Then they will explore
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 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 informationAs light level increases, resistance decreases. As temperature increases, resistance decreases. Voltage across capacitor increases with time LDR
LDR As light level increases, resistance decreases thermistor As temperature increases, resistance decreases capacitor Voltage across capacitor increases with time Potential divider basics: R 1 1. Both
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 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 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 informationExercise 1: Thermocouple Characteristics
The Thermocouple Transducer Fundamentals Exercise 1: Thermocouple Characteristics EXERCISE OBJECTIVE When you have completed this exercise, you will be able to describe and demonstrate the characteristics
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 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 20122013 Series
More informationPower lines. Why do birds sitting on a highvoltage power line survive?
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
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 informationName Date Time to Complete. NOTE: The multimeter s 10 AMP range, instead of the 300 ma range, should be used for all current measurements.
Name Date Time to Complete h m Partner Course/ Section / Grade Complex Circuits In this laboratory you will continue your exploration of dc electric circuits with a steady current. The circuits will be
More informationElectricity Worksheet (p.1) All questions should be answered on your own paper.
Electricity Worksheet (p.1) 1. In terms of attraction and repulsion, how do negative particles affect negative particles? How do negatives affect positives? 2. What happens to electrons in any charging
More informationModule 1, Add on math lesson Simultaneous Equations. Teacher. 45 minutes
Module 1, Add on math lesson Simultaneous Equations 45 minutes eacher Purpose of this lesson his lesson is designed to be incorporated into Module 1, core lesson 4, in which students learn about potential
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 informationDesigning a Thermostat Worksheet
Designing a Thermostat Worksheet Most of us have a thermostat in our homes to control heating and cooling systems of our home. These important devices help us save energy by automatically turning off energy
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 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 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 informationCircuitsOhm's Law. 1. Which graph best represents the relationship between the electrical power and the current in a resistor that obeys Ohm s Law?
1. Which graph best represents the relationship between the electrical power and the current in a resistor that obeys Ohm s Law? 2. A potential drop of 50 volts is measured across a 250 ohm resistor.
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 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 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 informationExercise 1: Thermistor Characteristics
Exercise 1: Thermistor Characteristics EXERCISE OBJECTIVE When you have completed this exercise, you will be able to describe and demonstrate the characteristics of thermistors. DISCUSSION A thermistor
More informationVoltage Sources. Potential Energy vs. Electric Potential. Clicker Question: Clicker Question:
Electrostatics Cont. Physics Open House Wednesday, November 5th Lab Tours! Free Pizza and Soft Drinks! Star Party at Campus Observatory! Learn about the Physics Department and our majors Potential Energy
More informationElectrodynamics. Review 8
Unit 8 eview: Electrodynamics eview 8 Electrodynamics 1. A 9.0 V battery is connected to a lightbulb which has a current of 0.5 A flowing through it. a. How much power is delivered to the b. How much energy
More informationIntroduction. Prelab 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 information1) Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V, are arranged in two different circuits.
1) Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V, are arranged in two different circuits. a. The two bulbs are first connected in parallel to a 120 V source. i. Determine the
More informationInsulators Nonmetals are very good insulators; their electrons are very tightly bonded and cannot move.
SESSION 11: ELECTRIC CIRCUITS Key Concepts Resistance and Ohm s laws Ohmic and nonohmic conductors Series and parallel connection Energy in an electric circuit Xplanation 1. CONDUCTORS AND INSULATORS
More informationName Date Time to Complete
Name Date Time to Complete h m Partner Course/ Section / Grade Complex Circuits In this laboratory you will connect electric lamps together in a variety of circuits. The purpose of these exercises is to
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 information Memorize the terms voltage, current, resistance, and power.  Know the equations Ohm s Law and the Electric Power formula
E: Know Circuit Vocabulary (Short Answer) Level 2 Prerequisites: Know Circuit Vocabulary (Short Answer); Recognize Insulators and Conductors Objectives:  Memorize the terms voltage, current, resistance,
More informationReview. Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
Review Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When more devices are added to a series circuit, the total circuit resistance: a.
More informationI depicted in Figure 1. When a current of I amps (A) flows through the resistor, a voltage drop V AB volts (V) appears across the terminals A and B.
ntroduction to DC Circuits v 0.92: September 20, 2018 Gerald ecktenwald gerry@pdx.edu 1 ntroduction Engineers from all disciplines need to have working knowledge of basic electrical circuits. These notes
More informationWhat does it mean for an object to be charged? What are charges? What is an atom?
What does it mean for an object to be charged? What are charges? What is an atom? What are the components of an atom? Define the following: Electric Conductor Electric Insulator Define the following: Electric
More informationAnswer Key. Chapter 23. c. What is the current through each resistor?
Chapter 23. Three 2.0 resistors are connected in series to a 50.0 power source. a. What is the equivalent resistance of the circuit? R R R 2 R 3 2.0 2.0 2.0 36.0 b. What is the current in the circuit?
More informationLecture 7.1 : Current and Resistance
Lecture 7.1 : Current and Resistance Lecture Outline: Current and Current Density Conductivity and Resistivity Resistance and Ohm s Law Textbook Reading: Ch. 30.330.5 Feb. 26, 2013 1 Announcements By
More informationBrian Blais Quick Homemade Guide to Circuits
Brian Blais Quick Homemade Guide to Circuits 1 Initial Equations and Concepts Current, I. Units:amps rate of flow of charge: I = Q/ t Potential difference, V. Units: volts esistance,. Units:ohms Ohm s
More informationVoltage, Current, Resistance, and Ohm's Law
Voltage, Current, Resistance, and Ohm's Law a learn.sparkfun.com tutorial Available online at: http://sfe.io/t27 Contents Electricity Basics Electrical Charge Voltage Current Resistance Ohm's Law An Ohm's
More informationTemperature Measurements
Engineering 80 Spring 2015 Temperature Measurements SOURCE: http://www.eng.hmc.edu/newe80/pdfs/vishaythermdatasheet.pdf SOURCE: http://elcodis.com/photos/19/51/195143/to923_standardbody to226_straightlead.jpg
More informationReview of Ohm's Law: The potential drop across a resistor is given by Ohm's Law: V= IR where I is the current and R is the resistance.
DC Circuits Objectives The objectives of this lab are: 1) to construct an Ohmmeter (a device that measures resistance) using our knowledge of Ohm's Law. 2) to determine an unknown resistance using our
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 [1e t/(rc) ] q = q 0 e t/(rc τ = RC
More information2. In words, what is electrical current? 3. Try measuring the current at various points of the circuit using an ammeter.
PS 12b Lab 1a Fun with Circuits Lab 1a Learning Goal: familiarize students with the concepts of current, voltage, and their measurement. Warm Up: A.) Given a light bulb, a battery, and single copper wire,
More informationActivity 1: Investigating Temperature
Contents Activity Overview... 5 Quick Start Guide... 5 Software Installation... 5 Hardware Setup... 6 mytemp Getting Started Program... 10 General Tips and Tricks... 11 Activity 1: Investigating Temperature...
More informationEXPERIMENT 9 Superconductivity & Ohm s Law
Name: Date: Course number: MAKE SURE YOUR TA OR TI STAMPS EVERY PAGE BEFORE YOU START! Lab section: Partner's name(s): Grade: EXPERIMENT 9 Superconductivity & Ohm s Law 0. PreLaboratory Work [2 pts] 1.
More informationStatic Electricity. Electric Field. the net accumulation of electric charges on an object
Static Electricity the net accumulation of electric charges on an object Electric Field force exerted by an e  on anything that has an electric charge opposite charges attract like charges repel Static
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 informationLorik educational academyvidyanagar
Lorik educational academyvidyanagar 9849180367  Section: Senior TOPIC: CURRENT ELECTRICITY
More informationElectric Charges & Current. Chapter 12. Types of electric charge
Electric Charges & Current Chapter 12 Types of electric charge Protons w/ + charge stuck in the nucleus Electrons w/  charge freely moving around the nucleus in orbits 1 Conductors Allow the easy flow
More informationDirectCurrent Circuits. Physics 231 Lecture 61
DirectCurrent Circuits Physics 231 Lecture 61 esistors in Series and Parallel As with capacitors, resistors are often in series and parallel configurations in circuits Series Parallel The question then
More informationLab 5  Capacitors and RC Circuits
Lab 5 Capacitors and RC Circuits L51 Name Date Partners Lab 5 Capacitors and RC Circuits OBJECTIVES To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance
More informationGreek Letter Omega Ω = Ohm (Volts per Ampere)
) What is electric current? Flow of Electric Charge 2) What is the unit we use for electric current? Amperes (Coulombs per Second) 3) What is electrical resistance? Resistance to Electric Current 4) What
More informationRelating Voltage, Current and Resistance
Relating Voltage, Current and Resistance Using Ohm s Law in a simple circuit. A Simple Circuit Consists of:! A voltage source often a battery! A load such as a bulb! Conductors arranged to complete a circuit
More informationB: Know Circuit Vocabulary: Multiple Choice Level 1 Prerequisites: None Points to: Know Circuit Vocabulary (Short Answer)
B: Know Circuit Vocabulary: Multiple Choice Level 1 Prerequisites: None Points to: Know Circuit Vocabulary (Short Answer) Objectives:  Memorize the definitions of voltage, current resistance, and power.
More informationWhat is dynamic electricity?
Dynamic Electricity What is dynamic electricity? Has to do with charges in motion So we re talking about moving electrons Think about any electronic device Dynamic electricity Think back to properties
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 informationELECTRICITY Electric Fence Experiment.
ELECTRICITY Electric Fence Experiment. Can you guess what will happen? What would life be like without electricity? List 4 things that you would miss the most: 1) 2) 3) 4) Positive and Negative Charge
More informationCircuits. 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 information2/25/2014. Circuits. Properties of a Current. Conservation of Current. Definition of a Current A. I A > I B > I C B. I B > I A C. I C D. I A E.
Circuits Topics: Current Conservation of current Batteries Resistance and resistivity Simple circuits 0.1 Electromotive Force and Current Conventional current is the hypothetical flow of positive charges
More informationWhich of these particles has an electrical charge?
Which of these particles has an electrical charge? A. Proton. B. Electron. C. Ion. D. All of the above. Which is the predominant carrier of charge in copper wire? A. Proton. B. Electron. C. Ion. D. All
More informationDirect Current (DC) Circuits
Direct Current (DC) Circuits NOTE: There are short answer analysis questions in the Participation section the informal lab report. emember to include these answers in your lab notebook as they will be
More informationIntroduction to Electricity
Introduction to Electricity Principles of Engineering 2012 Project Lead The Way, Inc. Electricity Movement of electrons Invisible force that provides light, heat, sound, motion... Electricity at the Atomic
More informationLab 8: Resistance, Series Circuits and Lights Out!
Lab 8: Resistance, Series Circuits and Lights Out! Introduction: The Coulomb force on an electron in a field is qe. Though we have studied charges and fields in free space, the same fundamental physics
More informationElectromagnetism Checklist
Electromagnetism Checklist Elementary Charge and Conservation of Charge 4.1.1A Convert from elementary charge to charge in coulombs What is the charge in coulombs on an object with an elementary charge
More informationElectricity. Lily, Laura, Lynette, Elyse, Gillian, Emma, Hailey Period 2. onedio.com
Electricity Lily, Laura, Lynette, Elyse, Gillian, Emma, Hailey Period 2 onedio.com Electrostatics vs. Electricity Electrostatics is the study of charges at rest Electrostatics: to help remember the difference
More informationThey keep the voltage the same and use this circuit to measure the current. Variable resistor. Reading on ammeter in amps
1 Ksenia and Eva investigate five different variable resistors. They set each variable resistor to the maximum resistance. They keep the voltage the same and use this circuit to measure the current. A
More informationWHAT ARE THE EFFECTS OF MOVING CHARGES?
ELECTRICITY WHAT ARE THE EFFECTS OF MOVING CHARGES? ELECTRICAL CHARGES Most atoms have the same number of protons and electrons. They often lose and gain electrons. When this happens, the atom s charge
More information11. ELECTRIC CURRENT. Questions and Answers between the forces F e and F c. 3. Write the difference between potential difference and emf. A.
CLSS10 1. Explain how electron flow causes electric current with LorentzDrude theory of electrons?. Drude and Lorentz, proposed that conductors like metals contain a large number of free electrons while
More informationLab 2: Kirchoff s Laws
ECE2205: Circuits and Systems I Lab 2 Department of Electrical and Computer Engineering University of Colorado at Colorado Springs "Engineering for the Future" Lab 2: Kirchoff s Laws 2. Objective The objective
More informationWhere I is the current in Amperes, q is the charge in coulombs, and t is the time in seconds.
CURRENT ELECTRICITY What is current? All of use like to ask this little question, which is quite easily answered, but not so easily understood. Current is the flow of charges. In other words, the flow,
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 5 CAPACITORS & RC CIRCUITS
L051 Name Date Partners Lab 5 CAPACITORS & RC CIRCUITS OBJECTIVES OVERVIEW To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance of conducting parallel
More informationPOE Practice Test  Electricity, Power, & Energy
Class: Date: POE Practice Test  Electricity, Power, & Energy Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following forms of energy is
More informationE40M Charge, Current, Voltage and Electrical Circuits. M. Horowitz, J. Plummer, R. Howe 1
E40M Charge, Current, Voltage and Electrical Circuits M. Horowitz, J. Plummer, R. Howe 1 Understanding the Solar Charger Lab Project #1 We need to understand how: 1. Current, voltage and power behave in
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 informationChapter 22: Current and Resistance Solutions
Chapter 22: Current and esistance Solutions Questions: 4, 7, 17, 21 Exercises & Problems: 1, 16, 22, 28, 36, 38, 51, 53, 55 Q22.4: A lightbulb is connected to a battery by two copper wires of equal lengths
More informationElectrical Equivalent of Heat J
Electrical Equivalent of Heat J Aim: To determine the electrical equivalent of heat (J). Apparatus: Electrical equivalent of heat jar, calorimeters, India Ink, regulated power supply of delivering up to
More information1 of 23. Boardworks Ltd Electrical Power
1 of 23 Boardworks Ltd 2016 Electrical Power Electrical Power 2 of 23 Boardworks Ltd 2016 What is electrical power? 3 of 23 Boardworks Ltd 2016 Electrical power is the rate at which energy is transferred
More informationLab 5  Capacitors and RC Circuits
Lab 5 Capacitors and RC Circuits L51 Name Date Partners Lab 5 Capacitors and RC Circuits OBJECTIVES To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance
More informationCircuits Gustav Robert Kirchhoff 12 March October 1887
Welcome Back to Physics 1308 Circuits Gustav Robert Kirchhoff 12 March 1824 17 October 1887 Announcements Assignments for Thursday, October 4th:  Reading: Chapter 27.34  Watch Video: https://youtu.be/ytoerwi8us
More informationChapter 25 Electric Currents and. Copyright 2009 Pearson Education, Inc.
Chapter 25 Electric Currents and Resistance 251 The Electric Battery Volta discovered that electricity could be created if dissimilar metals were connected by a conductive solution called an electrolyte.
More informationCurrent and Resistance
Current and Resistance 1 Define the current. Understand the microscopic description of current. Discuss the rat at which the power transfer to a device in an electric current. 2 21 Electric current 22
More informationresistance in the circuit. When voltage and current values are known, apply Ohm s law to determine circuit resistance. R = E/I ( )
DC Fundamentals Ohm s Law Exercise 1: Ohm s Law Circuit Resistance EXERCISE OBJECTIVE When you have completed this exercise, you will be able to determine resistance by using Ohm s law. You will verify
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Electromotive Force An electromotive force device, or emf device, is a source of constant potential. The emf describes the work done per unit charge and has units of
More informationElectricity. Prepared by Juan Blázquez, Alissa Gildemann. Electric charge is a property of all objects. It is responsible for electrical phenomena.
Unit 11 Electricity 1. Electric charge Electric charge is a property of all objects. It is responsible for electrical phenomena. Electrical phenomena are caused by the forces of attraction and repulsion.
More informationStudy of Resistance Components
Study of Resistance Components Purpose: The purpose of this exercise is to apply fundamental electrical circuit concepts to determine the response of electrical components subjected to a mechanical input
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 (020 V.). Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm). A. Kirchhoff's Loop Law Suppose that
More informationPart 4: Electricity & Magnetism
Part 4: Electricity & Magnetism Notes: Magnetism Magnetism Magnets: 1.Have a north and south pole 2.Like poles repel; opposite poles attract  The larger the distance between the magnets, the weaker the
More informationElectric Power a learn.sparkfun.com tutorial
Electric Power a learn.sparkfun.com tutorial Available online at: http://sfe.io/t72 Contents With Great Power... What is Electric Power? Wattage Calculating Power Power Ratings Resources and Going Further
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 informationChapter 25 Electric Currents and Resistance. Copyright 2009 Pearson Education, Inc.
Chapter 25 Electric Currents and Resistance 254 Resistivity Example 255: Speaker wires. Suppose you want to connect your stereo to remote speakers. (a) If each wire must be 20 m long, what diameter copper
More informationElectric Charge. Electric Charge ( q ) unbalanced charges positive and negative charges. n Units Coulombs (C)
Electric Charge Electric Charge ( q ) unbalanced charges positive and negative charges n Units Coulombs (C) Electric Charge How do objects become charged? Types of materials Conductors materials in which
More informationAtaglance unit content, assessment criteria and guidance
Ataglance unit content, assessment criteria and guidance To help you with assignment writing as well as assessing assignments, this table maps the Unit 6 content against the Unit 6 assessment criteria
More informationPhysicsAndMathsTutor.com
Electricity May 02 1. The graphs show the variation with potential difference V of the current I for three circuit elements. PhysicsAndMathsTutor.com When the four lamps are connected as shown in diagram
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 information