Lab 5: Simple Electrical Circuits


 Frederick Hamilton
 2 years ago
 Views:
Transcription
1 Lab 5: Simple Electrical Circuits Introduction: In this laboratory you will explore simple DC (direct current) electrical circuits. The primary goal of the lab will be to develop a model for electricity. A model is a clear mental picture that helps to explain how a physical system behaves and allows you to correctly predict what will happen in new situations. Note that a model is not a complete theory. A theory is a complete explanation in terms of known physical laws and mathematical equations. A model is the conceptual basis on which the complete theory is constructed. The method we will use to help you develop your model is a threestep procedure: predict/test/evaluate. You probably already have some concept, some idea of what electricity is and how it behaves. It may be right or wrong. Whatever it is, it is your initial model. You will be asked to predict what you think will happen in a given electrical circuit, based on this model. You will then test your prediction by making measurements on a real circuit. This, essentially, is how all good science is done. We make predictions based on what we think is a correct explanation of a system, then experiment to verify or refute our prediction. If the prediction was correct, that says the model is at least partially right. If the prediction was wrong, that says the model is either wrong or incomplete, and must be revised. The goal, of course, is to develop a model that always results in correct predictions. When we have done that, we can then say with some justification that we understand the system. So don t worry if your predictions are wrong at first. You will not lose points for incorrect predictions. In fact, correcting an erroneous model often results in more effective learning than simply verifying a correct one. So use this opportunity to make some mistakes and to learn from them. 1
2 1. A Simple Circuit a. Making a Bulb Light Your first objective is to make a bulb glow using a power supply, wires, and a bulb in a socket. A power supply is much like a battery, it is a source of Electromotive Force (EMF). EMF is the term we use to refer to the potential difference (or voltage ) that a battery develops across its terminals. For example, an ordinary flashlight battery (Dcell) has an EMF of 1.5 Volts. Procedure: Turn on the power supply, move the STBYON switch to the ON position, make sure the meter range switch is in the down (025V) position, and set the power supply to 5 Volts. You can now use the STBYON switch to turn the supply on or off without having to reset the voltage each time. Check that the current range control is set to 2A and the small center knob is turned fully clockwise. The power supply is now a source of 5 Volts of EMF. You are now ready to try and light the lightbulb. Connect a red wire to the positive terminal of the power supply and a black wire to the negative terminal and turn on the power supply by moving the STBYON switch to the ON position. Now experiment and see what it takes to light the bulb. Don t worry if the current limiter happens to turn off the power supply. Just reset it by pushing the red button near the current limiter knob, and resume your experimenting. When you have gotten the bulb to light, draw a picture on the worksheet of the circuit you used. Be sure to clearly indicate what wires were connected where. As a precaution against possible damage to the apparatus, always move the STBYON switch to the STBY position after you are finished experimenting. Further Investigation: Hopefully you found that in order to light the bulb you needed to create a closed path for the current to travel around. But what about the details? In particular, how is the filament (the part of the bulb that actually glows) connected to the external wires from the power supply? Procedure: Use the magnifying glass to inspect the bulb. Identify the filament and see how it is connected to the base of the bulb. Now unscrew the bulb from the socket. Turn the power supply on and try to make the bulb light by touching the connecting wires directly to the bulb itself. See just where on the bulb you have to make the connections in order to get the bulb to light. Answer the worksheet question about how the bulb works. 2
3 b. Measuring Current To light the bulb, you needed a complete circuit in which current can flow. But how does the current behave as it travels around the circuit? Is the current the same in the wire leading from the positive terminal of the power supply to the bulb as it is in the wire leading from the bulb to the negative terminal, or does the bulb somehow use up current? Let s apply our predict/test/evaluate method and find out. On the worksheet, write your prediction of what happens to the current in the circuit you have just been working with. Screw the bulb back into the socket and construct the circuit shown in Figure 1 below. Connect the multimeter as shown in the figure in order to measure the current flowing in the wire which leads from the positive terminal of the power supply to the bulb. Turn on the power supply and record the reading on your multimeter. Now turn the power supply off, disconnect the multimeter, and construct the circuit shown in Figure 2. below. Turn on the power supply and again record the reading on your multimeter. 3
4 Now evaluate your results. Were the two readings the same, or did they differ significantly? Note here that some slight variation in the last one or two digits of the meter reading is to be expected. No two measurements, even of the same quantity and made with the same instrument, can be exactly the same. There is always some uncertainty in any measurement. What you are looking for is significant differences (say greater than five or ten percent) between the two readings. If no significant differences are noted, you can conclude that the two measurements in fact agree. Record your evaluation on the worksheet. Was your prediction correct? If not, how do you have to modify your model in order to account for this new information? Use the space provided on the worksheet to explain what modifications (if any) are necessary. 2. A Slightly More Complicated Circuit Now consider the circuit shown in Figure 3. below. Such a circuit is called a series circuit because the two bulbs are connected one after the other rather than side by side. How will this circuit behave? In particular (assuming the power supply is still set to 5 Volts) will the current flowing in this circuit be the same as in the onebulb circuit, or not? Will the first bulb somehow use up some of the current so the second bulb gets less, or will the current through both bulbs be the same? Make your prediction on the worksheet. Now, making sure that the power supply is still set at 5 Volts, turn on the power supply and observe the behavior of this circuit. Record what you see. Now, using the same measurement technique you used in part 1, measure and record the current in all three wires of your series circuit. Now evaluate your results. Was your prediction correct? If not, what additional modifications in your model are necessary. Explain in the space provided on the worksheet. 4
5 3. Potential Differences in a Series Circuit Remove the multimeter and reconstruct your original series circuit, as shown in Figure 3. You should now have an accurate model of how the current in a series circuit behaves, but what about potential difference? The power supply develops a potential difference of 5.0 Volts across its terminals. In a circuit consisting of only a single bulb, this potential difference is obviously also developed across the terminals of the bulb. But what about in a circuit consisting of two or more bulbs in series? On the worksheet, predict, based on your model, how you expect the potential differences across the two bulbs to behave. Will the potential difference across each bulb be 5 Volts (since that s what the power supply is set at), or will something else happen? Now use your multimeter to measure and record the potential differences across the two bulbs. Also record, for comparison, the potential difference across the terminals of the power supply. Note that you may wish to measure this with the multimeter rather than simply relying on the power supply s voltmeter (which may not be as accurate). Now evaluate your results. Was your prediction correct or not. Explain in the space provided on the worksheet. 4. Resistance Resistance is defined as the ratio of the potential difference across the terminals of an electrical device to the current flowing through it. In equation form: R' V i Since a certain current flows through a bulb when a certain potential difference exists across its terminals, the resistance of the bulb can be easily determined using the above equation. For example, you probably found, for a single bulb, that a potential difference of 5 Volts resulted in a current of about 0.14 Amperes. So the resistance of the bulb, under these conditions, is about 36 Ω (ohms). But is the resistance of the bulb always this value? To answer that question, more data is needed. If current through a device is measured for several different values of potential difference, and the results graphed, we can learn more about the behavior of bulbs and other kinds of resistive devices. Figure 4, on the next page, shows several possible graphs of potential difference versus current through an electrical device. 5
6 If the graph is a straight line, then the resistance of the device is the same regardless of how much current is flowing through it. Such a device is said to be ohmic. If the graph is not a straight line, then the resistance of the device depends on operating conditions and the device is referred to as nonohmic. Lets investigate the behavior of two kinds of resistive devices, the bulb, and a resistor designed for use in electronic circuits. We ll use the computer to make simultaneous measurements of current and voltage and create graphs of our data for each of these devices. The computer can measure current and voltage by means of two devices called, respectively, a current probe and a voltage probe. These connect to a dual channel amplifier which interfaces them to the computer. Note: The current probe and the dual channel amplifier are easily damaged by either excessive current or excessive voltage, so great care must be taken in their use. Please be sure to observe all the operating precautions described below. 6
7 Set the power supply to 0 Volts (but do not turn it off completely), make sure the meter range switch is in the 025V position, place the STBYON switch to DC ON, reset the current range control to 0.5 A, and make sure the small inner knob is fully clockwise. Now assemble the circuit shown in figure 5. Make sure the current probe is connected with the correct polarity. The voltage probe is just a pair of clipleads connected to the dual channel amplifier. Connect them across the terminals of the bulb just as you would any voltmeter. You are now ready to investigate the resistive characteristics of the bulb. Procedure: Start the program Logger Pro. Click on File and open the folder Current and Voltage Probes. In it, find and open the file Simplecircuits1. You should see a graph of Voltage versus Current displayed. If this does not happen, consult your instructor. After making sure the power supply is at 0 Volts, but turned on, press the Collect button on the computer display. Then press the Keep button. This will put the first data point on your graph. Now increase power supply voltage to 1 Volt. Again press Keep. Increase to 2 Volts. Press Keep. Continue this process, putting data points on your graph, up to and including a supply voltage of 10 Volts. Then press Stop. Immediately return the power supply to 0 Volts and move the STBYON switch to STBY. Look at your graph. Which of the graphs in Figure 4 does it most resemble? Use the tangent button on the computer display to find the slope of your graph for the first, fifth and last data points on your graph, and record these values on your worksheet. Print a copy of your graph. Now connect the voltage probe leads across the terminals of the resistor, and repeat the above procedure. Remember to go no higher than 10 Volts on the power supply, and turn it off as soon as you are finished. 7
8 Now disassemble your circuit and use your multimeter to directly measure the resistances of the bulb and the resistor. Record your values on the worksheet. What do you conclude about the behavior of the bulb and the resistor? Is either of them ohmic? If so, which one? Or are both ohmic? If either one is not, how does its resistance depend on the amount of current flowing through it? Conclusion: You have now had some direct experience with electrical circuits. Perhaps you have found that what you already knew about electricity was correct, or perhaps you now know something you didn t know before. In either case, use the space provided on the worksheet to summarize your model of the behavior of electric circuits. If your initial model was correct, describe how the experiments you conducted verified it. If you had to revise your model, describe what your misconceptions were and what new understanding you have replaced them with. 8
9 Simple Electric Circuits Worksheet Name Name 1a. A simple circuit Draw the circuit you used to light the bulb. Draw an accurate sketch of the bulb showing clearly where on the bulb you had to touch the power supply wires in order to make the bulb glow. Clearly indicate how these points are connected to the filament. 9
10 1b. Measuring Current Prediction: Measurements: Current in wire from positive terminal to bulb: Current in wire from bulb to negative terminal: Evaluation: 10
11 2. A Slightly More Complicated Circuit Prediction: Observations: Measurements: Current in first wire: Current in second wire: Current in third wire: Evaluation: 11
12 3. Potential Differences in a Series Circuit Prediction: Measurements: Bulb One Potential Difference: Bulb Two Potential Difference: Power Supply EMF: Evaluation: 12
13 4. Resistance Resistance values: Bulb: First data point: Fifth data point: Last data point: Resistor: First data point: Fifth data point: Last data point: Direct resistance measurements (with multimeter) Bulb: Resistor: What are your conclusions about how the bulb and resistor behave? Record them here. 13
14 Conclusion: Summarize your model here: 14
Ohm s Law. Electrical Quantity Description Unit Water Analogy Voltage or Potential Difference
Ohm s Law Experiment 25 The fundamental relationship among the three important electrical quantities current, voltage, and resistance was discovered by Georg Simon Ohm. The relationship and the unit of
More informationOHM S LAW 05 AUGUST 2014
OHM S LAW 05 AUGUST 2014 In this lesson, we: Current Lesson Description Revise the definitions of current, potential difference and emf Explore Ohm s law Identify the characteristics of ohmic and nonohmic
More informationResistors in Series and Parallel
Resistors in Series and Parallel INTRODUCTION Direct current (DC) circuits are characterized by the quantities current, voltage and resistance. Current is the rate of flow of charge. The SI unit is the
More informationP150A Experimental Lab #7 Ohm s Law (Ver A 10/12)
Ohm s Law The fundamental relationship among the three important electrical quantities current, voltage, and resistance was discovered by Georg Simon Ohm. The relationship and the unit of electrical resistance
More informationGoals. Introduction R = DV I (7.1)
Lab 7. Ohm s Law Goals To understand Ohm s law, used to describe the behavior of electrical conduction in many materials and circuits. To calculate the electrical power dissipated as heat in electrical
More informationKirchhoff s Voltage Law and RC Circuits
Kirchhoff s oltage Law and RC Circuits Apparatus 2 1.5 batteries 2 battery holders DC Power Supply 1 multimeter 1 capacitance meter 2 voltage probes 1 long bulb and 1 round bulb 2 sockets 1 set of alligator
More informationLab 3  DC Circuits and Ohm s Law
Lab 3 DC Circuits and Ohm s Law L31 Name Date Partners Lab 3  DC Circuits and Ohm s Law OBJECTIES To learn to apply the concept of potential difference (voltage) to explain the action of a battery in
More informationEvaluation copy. Ohm s Law. Computer
Ohm s Law Computer 22 The fundamental relationship among the three important electrical quantities current, voltage, and resistance was discovered by Georg Simon Ohm. The relationship and the unit of electrical
More informationvery small Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: P31220 Lab
Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: Ohm s Law for electrical resistance, V = IR, states the relationship between
More informationResistance and Ohm s Law  MBL
Resistance and Ohm s Law  MBL In this experiment you will investigate different aspects of Ohm s Law, which relates voltage, current, and resistance. A computer will be used to collect, display, and help
More informationBasic DC Circuits. Electrical Quantity Description Unit Water Analogy Voltage or Potential Difference
Basic DC Circuits Current and voltage can be difficult to understand, because the flow of electrons and potential differences cannot be observed by the unaided human eye. To clarify these terms, some people
More informationPHYS2212 LAB Ohm s Law and Measurement of Resistance
Objectives PHYS2212 LAB Ohm s Law and Measurement of Resistance Part I: Comparing the relationship between electric current and potential difference (voltage) across an ohmic resistor with the voltagecurrent
More informationOhm s Law and Simple DC Circuits
Ohm s Law and Simple DC Circuits 2EM Object: Apparatus: To confirm Ohm s Law, to determine the resistance of a resistor, and to study currents, potential differences, and resistances in simple direct current
More informationQ1. (a) Complete the sentence below to name the instrument used to measure electrical current.
Q. (a) Complete the sentence below to name the instrument used to measure electrical current. The instrument used to measure electrical current is called... () (b) In the diagram below each box contains
More informationLab 4  Ohm s Law and Kirchhoff s Circuit Rules
Lab 4 Ohm s Law and Kirchhoff s Circuit Rules L41 Name Date Partners Lab 4 Ohm s Law and Kirchhoff s Circuit Rules OBJECTIES To learn to apply the concept of potential difference (voltage) to explain the
More informationR A _ + Figure 2: DC circuit to verify Ohm s Law. R is the resistor, A is the Ammeter, and V is the Voltmeter. A R _ +
Physics 221 Experiment 3: Simple DC Circuits and Resistors October 1, 2008 ntroduction n this experiment, we will investigate Ohm s Law, and study how resistors behave in various combinations. Along the
More informationOhmic and Non Ohmic Devices
Experiment 1 17 Kuwait University Physics 107 Physics Department Ohmic and Non Ohmic Devices Introduction In this experiment, you will study Ohm s law by examining the IV characteristics of a fixed resistor,
More informationLab 3 Ohm s Law and Resistors
` Lab 3 Ohm s Law and Resistors What You Need To Know: The Physics One of the things that students have a difficult time with when they first learn about circuits is the electronics lingo. The lingo and
More informationPreview of Period 12: Electric Circuits
Preview of Period 2: Electric Circuits 2. Voltage, Current, and esistance How are voltage, current, and resistance related? 2.2 esistance and Voltage of esistors in Connected in Series How does current
More informationUsing a Multimeter to Analyze a Circuit: Measuring Current and Voltage Calculating Power and Resistance
Name: Date: Using a Multimeter to Analyze a Circuit: Measuring Current and Voltage Calculating Power and Resistance Background Information and PreLab Activity Materials: One solar module One small DC
More informationElectric Circuits II. Physics 133 Experiments Electric Circuits II 1
Physics 133 Experiments Electric Circuits II 1 Electric Circuits II GOALS To examine Ohm's Law: the pivotal relationship between voltage and current for resistors To closely study what current does when
More informationCapacitors & RC Circuits
Capacitors & C Circuits Name: EQUIPMENT NEEDED: Circuits Experiment Board One Dcell Battery Wire leads Multimeter Capacitors(100 F, 330 F) esistors(1k, 4.7k ) Logger Pro Software, ULI Purpose The purpose
More information21 Lab 5: Series and Parallel Circuits
21 Lab 5: Series and Parallel Circuits Components in an electrical circuit are in series when they are connected one after the other, so that the same current flows through both of them. Components are
More informationBackground: Electric resistance, R, is defined by:
RESISTANCE & OHM S LAW (PART I and II)  8 Objectives: To understand the relationship between applied voltage and current in a resistor and to verify Ohm s Law. To understand the relationship between applied
More informationCapacitors. Evaluation copy
Capacitors Computer 24 The charge q on a capacitor s plate is proportional to the potential difference V across the capacitor. We express this relationship with q V =, C where C is a proportionality constant
More informationOhm s and Kirchhoff s Circuit Laws. Abstract. Introduction and Theory. EE 101 Fall 2007 Date: Lab Section #: Lab #2
EE 101 Fall 2007 Date: Lab Section #: Lab #2 Name: Ohm s and Kirchhoff s Circuit Laws Abstract Rev. 20070725JPB Partner: Electrical circuits can be described with mathematical expressions. In fact, it
More informationMaximum value. resistance. 1. Connect the Current Probe to Channel 1 and the Differential Voltage Probe to Channel 2 of the interface.
Series and Parallel Circuits Computer 23 Components in an electrical circuit are in series when they are connected one after the other, so that the same current flows through both of them. Components are
More informationGENERAL SCIENCE LABORATORY 1110L Lab Experiment 6: Ohm s Law
GENERAL SCIENCE LABORATORY 1110L Lab Experiment 6: Ohm s Law OBJECTIVES: To verify Ohm s law, the mathematical relationship among current, voltage or potential difference, and resistance, in a simple circuit.
More informationRESISTANCE & OHM S LAW (PART I
RESISTANCE & OHM S LAW (PART I and II) Objectives: To understand the relationship between potential and current in a resistor and to verify Ohm s Law. To understand the relationship between potential and
More informationPHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three and FourTerminal Black Boxes
PHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three and FourTerminal Black Boxes Print Your Name Print Your Partners' Names Instructions February 5, 2015 Before
More information3 DC Circuits, Ohm's Law and Multimeters
3 DC Circuits, Ohm's Law and Multimeters Theory: Today's lab will look at some basics of electricity and how these relate to simple circuit diagrams. Three basic terms are important to a study of electricity.
More informationLAB ELEC 25.CALC From Physics with Calculators, Vernier Software & Technology, 2003
OHM S LAW LAB ELEC 25.CALC From Physics with Calculators, Vernier Software & Technology, 2003 INTRODUCTION The fundamental relationship among the three important electrical quantities current, voltage,
More informationExperiment #3, Ohm s Law
Experiment #3, Ohm s Law 1 Purpose Physics 182  Summer 2013  Experiment #3 1 To investigate the oltage, , characteristics of a carbon resistor at room temperature and at liquid nitrogen temperature,
More informationPHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (IV) curves
Purpose: PHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (IV) curves Measure the current voltage curve of a light bulb and a resistor using a variable d.c. power supply. Understanding of Ohm
More informationResistors. Jeffrey La Favre
1 Resistors Jeffrey La Favre Resistors One of the most basic components (parts) used in electronics is the resistor. Resistors are used to control the amount of current that flows in a circuit and to reduce
More informationSERIES AND PARALELL CIRCUITS
SERES AND PARALELL CRCUTS LAB ELEC 2.COMP From Physics with Computers, Vernier Software & Technology, 2003 NTRODUCTON Components in an electrical circuit are in series when they are connected one after
More informationPHY 101 Lab 7 on Electric circuits: Direct current circuits Your name: Other team members:
PHY 101 Lab 7 on Electric circuits: Direct current circuits Your name: Other team members: Goals: To explore the basic principles of electric circuits, and how to measure them. Materials: Electrical resistors
More informationMeters  Ohm s Law R 2 R 1 APPARATUS INTRODUCTION R 1 R 2 A
Meters  Ohm s Law APPARATUS 1. Board on which two wires are mounted, each 1 m long, equipped with a sliding contact 2. Rheostat (variable resistance), 0... 7 Ω 3. DC ammeter (full scale: 2 A) 4. Voltmeter
More informationElectrical Circuits. Ammeter Light Bulb Ohmmeter. Power Supply Resistor Voltmeter. Symbols for Electrical Components.
PHSC 101 Electrical Circuits Name Purpose To learn how to measure resistance, voltage, and current using a multimeter. To become familiar with the basic components of simple electrical circuits and Ohm's
More informationPHYSICS 176 UNIVERSITY PHYSICS LAB II. Experiment 2 (two weeks) Direct Current Measurement and Ohm's Law
PHYSICS 176 UNIVERSITY PHYSICS LAB II Experiment 2 (two weeks) Direct Current Measurement and Ohm's Law Equipment: Supplies: VOM (voltohmmilliammeter), digital multimeter, power supply. 1/2 watt carbon
More informationENGR 1181 Lab 3: Circuits
ENGR 1181 Lab 3: Circuits Lab Procedure Report Guidelines 2 Goal of the Circuits: The Circuits Lab introduces series and parallel circuit which are used by engineers. Students will review this document
More informationResistorCapacitor (RC) Circuits
ResistorCapacitor (RC) Circuits Introduction In this second exercise dealing with electrical circuitry, you will work mainly with capacitors, which are devices that are used to store charge for later
More informationPreLab 7 Assignment: Capacitors and RC Circuits
Name: Lab Partners: Date: PreLab 7 Assignment: Capacitors and RC Circuits (Due at the beginning of lab) Directions: Read over the Lab Handout and then answer the following questions about the procedures.
More informationKirchhoff s Laws. Kirchhoff's Law #1  The sum of the currents entering a node must equal the sum of the currents exiting a node.
Kirchhoff s Laws There are two laws necessary for solving circuit problems. For simple circuits, you have been applying these equations almost instinctively. Kirchhoff's Law #1  The sum of the currents
More information1 THE LIGHT BULB EXPERIMENT: Exploring Simple Electric Circuits
1 THE LIGHT BULB EXPERIMENT: Exploring Simple Electric Circuits Preparatory Questions for Review: (also read this guide sheet, which contains some of the answers!) 1. State Ohm s Law, defining every term
More informationOhms Law IDC Circuits with Light Bulbs PhET Lab I with Ammeters and Voltmeters
Ohms Law IDC Circuits with Light Bulbs PhET Lab I with Ammeters and Voltmeters by Dr. James E. Parks Department of Physics and Astronomy 401 Nielsen Physics Building The University of Tennessee Knoxville,
More information1) 10. V 2) 20. V 3) 110 V 4) 220 V
1. The diagram below represents an electric circuit consisting of a 12volt battery, a 3.0ohm resistor, R 1, and a variable resistor, R 2. 3. What is the total resistance of the circuit 1) 6.6 Ω 2) 10
More informationChapter 13: Electric Circuits
Chapter 13: Electric Circuits 1. A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps. What is the maximum number of 100 watt light bulbs which can be lit simultaneously in parallel
More informationPhysics 1021 Experiment 6. Ohm s Law and Equivalent Resistance V=IR. Georg Simon Ohm ( )
1 Physics 1021 Ohm s Law and Equivalent Resistance V=IR Georg Simon Ohm (17891854) 2 Ohm s Law Electric current, I, is a measure of the flow of charge. It is rate of charge with time across a given point
More informationKirchhoff s Voltage Law
BASIC ELECTRICAL Kirchhoff s Voltage Law OBJECTIVES Define Kirchhoff s Voltage Law Discuss how Kirchhoff s Voltage Law applies to Series and Parallel Circuits Calculate Voltage drops in a Series and Parallel
More informationActivity 8 Ohms Law and Circuits PHYS 010
Name: Date: Partners: Purpose: To study the relationship between voltage, current and resistance and apply this understanding to simple series and parallel circuits. Materials: 1. 2 identical bulbs, and
More informationEXPERIMENT #2: DC Circuits and Tools
Name/NetID: Teammate/NetID: EXPERIMENT #2: DC Circuits and Tools Laboratory Outline In today s lab we ll begin developing the fundamental knowledge and skills you ll need to conduct basic experiments.
More informationExperiment 3 ~ Ohm's Law, Measurement of Voltage, Current and Resistance
Experiment 3 ~ Ohm's Law, Measurement of Voltage, Current and Resistance Objective: In this experiment you will learn to use the multimeter to measure voltage, current and resistance. Equipment: Bread
More informationEXPERIMENT 6 CHARGE SHARING BY CAPACITORS
60 6 I. THEORY EXPERIMENT 6 HARGE SHARING BY APAITORS The purpose of this experiment is to test the theoretical equations governing charge sharing by capacitors and to measure the capacitance of an "unknown"
More informationResistance, Ohm s Law, and the Temperature of a Light Bulb Filament
Resistance, Ohm s Law, and the Temperature of a Light Bulb Filament Name Partner Date Introduction Carbon resistors are the kind typically used in wiring circuits. They are made from a small cylinder of
More informationBASIC ELECTRONICS PROF. T.S. NATARAJAN DEPT OF PHYSICS IIT MADRAS LECTURE4 SOME USEFUL LAWS IN BASIC ELECTRONICS
BASIC ELECTRONICS PROF. T.S. NATARAJAN DEPT OF PHYSICS IIT MADRAS LECTURE4 SOME USEFUL LAWS IN BASIC ELECTRONICS Hello everybody! In a series of lecture on basic electronics, learning by doing, we now
More informationExperiment #6, Series and Parallel Circuits, Kirchhoff s Laws
Physics 182 Spring 2013 Experiment #6 1 Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws 1 Purpose Our purpose is to explore and validate Kirchhoff s laws as a way to better understanding
More informationSeries and Parallel Resistive Circuits Physics Lab VIII
Series and Parallel Resistive Circuits Physics Lab VIII Objective In the set of experiments, the theoretical expressions used to calculate the total resistance in a combination of resistors will be tested
More informationElectrical Circuits. Ammeter Light Bulb Ohmmeter. Power Supply Resistor Voltmeter. Symbols for Electrical Components.
Physical Science 101 Electrical Circuits Name Partner s Name Purpose To learn how to measure resistance, voltage, and current using a multimeter. To become familiar with the basic components of simple
More informationSaturday Xtra XSheet: 19. Electric circuits
Saturday Xtra XSheet: 9 Key Concepts Electric circuits This lesson focuses on the following: Potential Difference Current The resistance of a conductor Ohm s Law and circuit calculations Terminology
More informationSeries & Parallel Circuits Challenge
Name: Part One: Series & Parallel Circuits Challenge 1. Build a circuit using two batteries and two light bulbs in a way to illuminate the two light bulbs so that if either light bulb is disconnected,
More informationCircuits and Resistivity
Circuits and Resistivity Look for knowledge not in books but in things themselves. W. Gilbert OBJECTIVES To learn the use of several types of electrical measuring instruments in DC circuits. To observe
More informationMeasuring Electric Phenomena: the Ammeter and Voltmeter
Measuring Electric Phenomena: the Ammeter and Voltmeter 1 Objectives 1. To understand the use and operation of the Ammeter and Voltmeter in a simple direct current circuit, and 2. To verify Ohm s Law for
More informationExperiment #4: Basic Electrical Circuits
Purpose: Equipment: Discussion: Experiment #4: Basic Electrical Circuits Rev. 07042006 To construct some simple electrical circuits which illustrate the concepts of current, potential, and resistance,
More informationActivity 1: Light Emitting Diodes (LEDs)
Activity 1: Light Emitting Diodes (LEDs) Time Required: 45 minutes Materials List Group Size: 2 Each pair needs: One each of the following: One Activity 1 bag containing: o Red LED o Yellow LED o Green
More informationElectric Currents. Electric Potential Energy 11/23/16. Topic 5.1 Electric potential difference, current and resistance
Electric Currents Topic 5.1 Electric potential difference, current and resistance Electric Potential Energy l If you want to move a charge closer to a charged sphere you have to push against the repulsive
More informationHow Does it Flow? Electricity, Circuits, and Motors
How Does it Flow? Electricity, Circuits, and Motors Introduction In this lab, we will investigate the behavior of some direct current (DC) electrical circuits. These circuits are the same ones that move
More informationOhm s Law and Simple Electrical Connections
Ohm s Law and Simple Electrical Connections Purpose: To experimentally verify Ohm s Law and to provide experience in making series and parallel electrical connections. TO OD RUNNG FUSES CHECK LL CRCUT
More informationPHYSICS LAB. Capacitor. Date: GRADE: PHYSICS DEPARTMENT JAMES MADISON UNIVERSITY. Revision November 2002. Capacitor 21
PHYSICS LAB Capacitor Printed Names: Signatures: Date: Lab Section: Instructor: GRADE: PHYSICS DEPARTMENT JAMES MADISON UNIVERSITY Revision November 2002 Capacitor 21 Blank page Capacitor 22 CHARGING AND
More informationPHYS 2426 Engineering Physics II EXPERIMENT 5 CAPACITOR CHARGING AND DISCHARGING
PHYS 2426 Engineering Physics II EXPERIMENT 5 CAPACITOR CHARGING AND DISCHARGING I. OBJECTIVE: The objective of this experiment is the study of charging and discharging of a capacitor by measuring the
More informationSection 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate. Learning Outcomes
Section 4: Ohm s Law: Putting up a Resistance Section 4 Ohm s Law: Putting up a Resistance What Do You See? Learning Outcomes In this section, you will Calculate the resistance of an unknown resistor given
More informationCircuits. Page The diagram below represents a series circuit containing three resistors.
Name: Circuits Date: 1. Which circuit segment has an equivalent resistance of 6 ohms? 4. The diagram below represents a series circuit containing three resistors. 2. Base your answer to the following question
More informationNoteARific: Characteristics
NoteARific: Characteristics Any path along which electrons can flow is a circuit. For a continuous flow of electrons, there must be a complete circuit with no gaps. A gap is usually an electric switch
More informationChapter 6. Experiment 4: Electric Currents and Circuits. 6.1 Introduction The Electric Current
Chapter 6 Experiment 4: Electric Currents and Circuits 6.1 Introduction The resistance to the flow of an electric current is essential in the design of electronic devices and electric circuits generally.
More informationLab 5 RC Circuits: Charge Changing in Time Observing the way capacitors in RC circuits charge and discharge.
Print Your Name Lab 5 RC Circuits: Charge Changing in Time Observing the way capacitors in RC circuits charge and discharge. Print Your Partners' Names Instructions October 15, 2015October 13, 2015 Read
More informationName Partner Date Class
Name Partner Date Class Ohm's Law Equipment: Resistors, multimeters, VOM, alligator clips, wires, breadboard, batteries, 1/4 or 1/2 Amp fuse, low voltage power supply. Object: The object of this exercise
More informationElectrical Measurements
Electrical Measurements Experimental Objective The objective of this experiment is to become familiar with some of the electrical instruments. You will gain experience by wiring a simple electrical circuit
More informationSIMPLE ELECTRIC CIRCUITS
18 Preparatory Questions: (also read this guide sheet, which contains some of the answers!) 1. State Ohm s Law, defining every term in the equation. 2. If a bulb connected directly to a 6 V battery glows
More informationEXPERIMENT 7 OHM S LAW, RESISTORS IN SERIES AND PARALLEL
260 7 I. THEOY EXPEIMENT 7 OHM S LAW, ESISTOS IN SEIES AND PAALLEL The purposes of this experiment are to test Ohm's Law, to study resistors in series and parallel, and to learn the correct use of ammeters
More informationOhm s Law & Series Circuit
Open the TINspire document Ohms_Law_&_Series_Circuit.tns. We all use and rely on electric circuits every day by flipping a switch, turning up the volume, or operating a computer or calculator. Even the
More informationch 18 practice Multiple Choice
ch 18 practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following is the best description of a schematic diagram? a. uses pictures
More informationseries Connecting a voltage source across two resistors in parallel forces the voltage to be the same across both resistors.
I. Objective To discover how DC values are measured using various tools in the laboratory. This includes the basic design of multimeters and oscilloscopes, and how to model these circuits using Spice.
More informationElectric Circuits II
Electric Circuits II Experiment 4: Resistances in Circuits Equipment needed:  AC/DC Electronic Lab Board: Resistors  Multimeter Purpose The purpose of this lab is to begin experimenting with the variables
More informationCircuitsCircuit Analysis
Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9volt battery is connected to a 4ohm resistor and a 5ohm resistor as shown in the diagram below. A 3.0ohm resistor,
More informationTwo kinds of electrical charges
ELECTRICITY NOTES Two kinds of electrical charges Positive charge Negative charge Electrons are negatively charged Protons are positively charged The forces from positive charges are canceled by forces
More informationLab 5 RC Circuits. What You Need To Know: Physics 226 Lab
Lab 5 R ircuits What You Need To Know: The Physics In the previous two labs you ve dealt strictly with resistors. In today s lab you ll be using a new circuit element called a capacitor. A capacitor consists
More informationFig. 1 Analogue Multimeter Fig.2 Digital Multimeter
ELECTRICAL INSTRUMENT AND MEASUREMENT Electrical measuring instruments are devices used to measure electrical quantities such as electric current, voltage, resistance, electrical power and energy. MULTIMETERS
More informationExperiment #5, Series and Parallel Circuits, Kirchhoff s Laws
Physics 182 Summer 2013 Experiment #5 1 Experiment #5, Series and Parallel Circuits, Kirchhoff s Laws 1 Purpose Our purpose is to explore and validate Kirchhoff s laws as a way to better understanding
More information1. If each of the four resistors below has a resistance of 1 µω, what is the equivalent resistance of the combination?
1. If each of the four resistors below has a resistance of 1 µω, what is the equivalent resistance of the combination? V (a) 0.25 µω (b) 1 µω (c) 2 µω (d) 4 µω (e) none of these 2. Three identical lamps
More informationLab E1: Introduction to Circuits
E1.1 Lab E1: Introduction to Circuits The purpose of the this lab is to introduce you to some basic instrumentation used in electrical circuits. You will learn to use a DC power supply, a digital multimeter
More informationElectronicsLab1.nb 1. Electronics Lab #1. Ohm's Law and Simple Circuits
ElectronicsLab1.nb 1 Electronics Lab #1 Ohm's Law and Simple Circuits In this laboratory, you will verify Ohm's law V=iR where V is the voltage, i is the current and R is the resistance. You will learn
More information10 Resistors in Series and Parallel; Measuring I & V
Chapter 0 esistors in Series and Parallel; Measuring & 0 esistors in Series and Parallel; Measuring & The analysis of a circuit involves the determination of the voltage across, and the current through,
More informationLab 2: Resistance, Current, and Voltage
2 Lab 2: Resistance, Current, and Voltage I. Before you come to la.. A. Read the following chapters from the text (Giancoli): 1. Chapter 25, sections 1, 2, 3, 5 2. Chapter 26, sections 1, 2, 3 B. Read
More informationR1 R2 R3. Figure1. Resistances in series V1 I. Figure 2. Equivalent circuit of figure 1 if RE= R1+R2+R3 VRE =V
Supplementary Notes for Unit 2  Part A (Unit 3 and 4 exams also includes the topics detailed in this note) Series circuits A series circuit is a circuit in which resistors are arranged in a chain, so
More informationSolutions to Bulb questions
Solutions to Bulb questions Note: We did some basic circuits with bulbs in fact three main ones I can think of I have summarized our results below. For the final exam, you must have an understanding of
More informationExperiment: Series and Parallel Circuits
Phy203: General Physics Lab page 1 of 6 Experiment: Series and Parallel Circuits OBJECTVES MATERALS To study current flow and voltages in series and parallel circuits. To use Ohm s law to calculate equivalent
More informationphysics 112N current, resistance and dc circuits
physics 112N current, resistance and dc circuits current! previously we considered electrostatic situations in which no Efield could exist inside a conductor! now we move to the case where an electric
More informationUNIVERSITY OF NORTH CAROLINA AT CHARLOTTE. Department of Electrical and Computer Engineering
UNIVERSITY OF NORTH CAROLINA AT CHARLOTTE Department of Electrical and Computer Engineering Experiment No. 6 Precision Resistance Measurements Introduction: It is sometimes necessary to make resistance
More informationHow do you measure voltage and current in electric circuits? Materials
20A Electricity How do you measure voltage and current in electric circuits? Electricity Investigation 20A We use electricity every day, nearly every minute! In this Investigation you will build circuits
More informationPreview of Period 13: Electrical Resistance and Joule Heating
Preview of Period 13: Electrical Resistance and Joule Heating 13.1 Electrical Resistance of a Wire What does the resistance of a wire depend upon? 13.2 Resistance and Joule Heating What effect does resistance
More information