# `Ohm s Law III -- Resistors in Series and Parallel

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 `Ohm s Law III -- esistors in Series and Parallel by Dr. ames E. Parks Department of Physics and Astronomy 40 Nielsen Physics Building he University of ennessee Knoxville, ennessee Copyright August, 007 by ames Edgar Parks* *All rights are reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage or retrieval system, without permission in writing from the author. Objectives he objectives of this experiment are: () to understand and use Ohm s Law, () to learn, understand, and use resistors connected in series and parallel, () to learn the basic concepts and relationships of current and voltage measurements in DC circuits containing resistors wired in series and parallel, (4) to learn the relationships of the total resistance of resistors connected in series and parallel, and (5) to learn to use ammeters, voltmeters, ohmmeters, and multimeters to properly measure voltages, currents, and resistances. Introduction Most common household electrical circuits are made of many devices connected in parallel. Each device is hooked to the power source in parallel with all the other devices, each connected to the same voltage source and availing itself of the same voltage. Each device has its own characteristic resistance, and therefore each draws from the source a different amount of current, depending on its resistive value. While the voltage being accessed is nearly the same for all devices, the amount of current drawn from the source increases as each device draws its respective current based on its resistance. As a result as more and more devices are connected in parallel, the total amount of current drawn from the source increases. It thus has the effect of causing the resistance to decrease with each additional resistance added. Additional devices added to a circuit, require additional current from the source until something is overloaded. More current is required beyond that which can be supplied by the source or carried by the conductors without burning up. Series circuits are not as common, except for old time Christmas tree lights that are a challenge to fix when one unknown bulb has burned out and all the rest fail to work.

2 Ohm s Law III esistors in Series and Parallel However, all wires that make connections and the connections themselves qualify as series resistance. Wires have resistance that depend on wire size, length, and type of material. Wires add series resistance to circuits, just as good and bad connections add also. In order to fully understand electrical circuits and their behavior, one must first understand Ohm s Law and the principles regarding resistors in series and parallel circuits. heory Ohm s Law Ohm s Law is the relationship between the current I flowing through a resistance and the potential drop across it. he current is directly proportional to the potential difference across the resistance and is inversely proportional to the resistance, I =. () As an alternative, Ohm s Law may be stated as: he potential difference across a resistance is directly proportional to the current I flowing through the resistance and the resistance, or Ohm s Law can be rearranged to define the resistance so that = I. () = I. () If the potential difference across the resistance is measured in volts () and the current flowing through the resistance is measured in amperes (A), then the resistance values will be in units of ohms. esistors in Series Figure shows resistors,,, and, connected in series in a closed circuit powered by a single battery or Emf source. In this circuit the current supplied by the battery flows through each resistor, with the current in each resistor being the same. If the current supplied by the battery is I, the current in each resistor is I, I, and I, and they are all one and the same, then I = I = I = I. (4) Ohms Law III Series Parallel esistors.doc //08/5: PM

3 Ohm s Law III esistors in Series and Parallel I E I I I Figure. hree resistors,, and connected in series. he voltage drop across the battery will be the total sum of the individual drops across each of the resistors, and = + +. (5) where is the potential difference across, is the potential difference across, and is the potential difference across. From Equation, = I I, (6) = I, (7) and = I = I, (8). (9) Substituting these equations into Equation 5 gives and since I = I = I = I I = I + I + I (0) = + +. () herefore, when resistors are connected in series, the total resistance is just the sum of the individual resistances. While this has been shown for resistors, the total resistance of any number N (N ) of resistors connected in series, end to end, can be found using the same general procedure. herefore for resistors connected in series Ohms Law III Series Parallel esistors.doc //08/5: PM

4 Ohm s Law III esistors in Series and Parallel N = i. () i= esistors in Parallel esistors are connected in parallel when one end of each resistor is connected to a common point and each of their other ends is connected to another common point as shown in Figure. he current I that is supplied by the battery is divided into separate currents, I, I, and I, each flowing through resistors,, and respectively. After flowing through the resistors, the currents rejoin into a common current, I, or that current flowing back to the battery. he total current flowing in the circuit is the sum of the separate currents flowing through the resistors, I = I + I + I. () I E I I I Figure. hree resistors,, and connected in parallel showing the flow of current. From Equation the total current is related to the total voltage and total resistance by I =. (4) and the current, potential difference, and resistance of each separate resistor is given by I =, (5) Ohms Law III Series Parallel esistors.doc //08/5: PM 4

5 Ohm s Law III esistors in Series and Parallel and I = I =, (6). (7) Substituting these equations into Equation = + +. (8) he voltage drops across the battery and resistors are all equal, and as illustrated in Figure, = = =. (9) E Figure. hree resistors,, and connected in parallel showing the potential differences all being equal. Since all the potentials are equal Equation 8 reduces to = + + (0) which is the equation for the total resistance of resistors connected in parallel. As was the case for series resistors, the total resistance of any number N (N ) of resistors Ohms Law III Series Parallel esistors.doc //08/5: PM 5

6 Ohm s Law III esistors in Series and Parallel connected in parallel can be found using the same general procedure and will result in the relationship N =. () i= i In circuits with combinations of resistors in series and parallel, the total resistance can be found by breaking the circuit down into its simplest unit consisting of either resistor in series or parallel and then adding its total resistance back into the next simplest unit and finding its total resistance, and so on until the entire circuit has been reconstructed. Apparatus he apparatus is shown in Figure 4 and consists of: () Meterman Model 5XP digital multimeters, DMMs, () a prototype circuit board with banana jacks for wiring the circuits, () a Pasco model PI-9877 power supply, (4) stackable double banana plugs with resistors or shorting bars (jumper wires) mounted, and (5) assorted leads with banana plugs. hese components have been chosen to minimize problems with improper use, while at the same time providing good results for analysis and learning the concepts. he digital meter provides convenience and accuracy of readings consistent with modern instrumentation. he digital multimeters can read voltages, currents, and resistance, but have to be properly connected to the correct inputs. here are separate inputs for voltage and resistance measurements and for current measurements. he center switch can be adjusted for the specific function that is needed and/or the range of the chosen function. he power supply can be adjusted to supply voltages of 0 to 8 volts, but the current that it can supply is limited to ampere. he power supply has extra features not needed in this experiment and should be disregarded. he digital ammeter is fused with a ampere fuse and should withstand the maximum current available from the power supply. he prototype circuit board has an array of banana jacks conveniently laid out in a manner to wire and to help expedite the construction of the circuits to be studied. he array is constructed such that a minimum number of jumper plugs are needed. esistors are supplied mounted to stackable double banana plugs that can installed at a desired position on the circuit board. Connections between banana jacks on the circuit board can be made either by using a stackable double banana plug with a jumper wire across its terminals or with a lead wire with a banana plug on each end. esistors are mounted on red stackable double banana plugs and are numbered,, and. Shorting bars or jumper wires are mounted on black stackable double banana plugs and can be used to make connections on the prototype circuit board. Additional lead wires with banana plugs are used to make connections to the meters and power supply. Ohms Law III Series Parallel esistors.doc //08/5: PM 6

7 Ohm s Law III esistors in Series and Parallel esistors are manufactured in many different materials, forms, shapes, values, power ratings, and tolerances. While some resistor values are labeled with text, common resistors are color coded with bands to indicate their ohmic values. he color-numeric key is given in able. he first colored band represents the first digit of the value followed by a second band for second digit. A third band indicates the number of zeros following the second digit. he fourth band indicates the tolerance, the maximum percent difference the actual value may have from the indicated value. For example a resistor marked with a green band followed by violet, brown, and silver bands, indicates a value of 570 ±0% ohms. he code can be remembered as starting with black, no color or 0, followed by brown, a little color. he color brown is then followed by the colors of the rainbow, red, orange, yellow, green, blue, and violet for the numbers through 7. Gray and white finish the code for the digits 8 and 9, with white being the extreme difference and opposite black. Color Code Black Bk 0 Brown Br ed Orange O Yellow Y 4 Green Gn 5 Blue Bl 6 iolet 7 Gray Gy 8 White W 9 olerance Code Gold Gd 5% Silver S 0% None N 0% able Ohms Law III Series Parallel esistors.doc //08/5: PM 7

8 Ohm s Law III esistors in Series and Parallel Figure 4. Apparatus for Ohms Law experiment to study resistors in series and parallel. Procedure Ideally, when ammeters and voltmeters are placed in a circuit, their placement does not perturb the circuit, so as to change the current and voltage values associated with each component that existed before their placement. In practice this always occurs, however, the changes can be minimized with the use of high impedance digital voltmeters and low impedance current devices. he Meterman5XP Digital Multimeter meets these conditions rather well, but there will be some slight changes in the values measured and the values that existed before their placement. It should be noted that the values read by the meter are the correct values for the measurement being taken. he actual values just change back to their unperturbed values when the meters are taken out of the circuit. In this experiment, the effects of introducing an ammeter or voltmeter into a circuit will be neglected. As a result, values that are measured may not produce results that are in exact agreement with the theory that is being tested. However, the deviations of the measured values with the theoretical predictions will be very small. he emphasis of this experiment is to learn the concepts of DC circuits, Ohm s Law, and the addition of resistors in series and parallel. he effects of the ammeters and voltmeters on the circuit is studied in the preceding experiment. Ohms Law III Series Parallel esistors.doc //08/5: PM 8

9 Ohm s Law III esistors in Series and Parallel Procedure CAUION! Do not turn on the power supply until you are ready to make measurements, and when you are finished making measurement, turn the power supply output voltage to zero and then turn the power off until the next measurements are made. he Ohmmeter. An Excel data sheet should be constructed as shown in Figure 5 to enter your data and to plot and analyze your results. ename the Sheet worksheet, Parallel esistors by right clicking on the Sheet tab at the bottom of the workbook and choosing rename in the pop up menu. ype in the new name in the highlighted tab. Figure 5. Example of Excel spreadsheet for recording and reporting data. Ohms Law III Series Parallel esistors.doc //08/5: PM 9

17 Ohm s Law III esistors in Series and Parallel Power Supply 4 PS Figure. Wiring aid and schematic diagrams for measuring voltages across resistors in series and separately.. emove the voltmeter and place it across resistor # at position. ead and record the voltage,, across resistor #. otal esistor # esistor # esistor # Sum + + % Difference otal & Sum esistors in Series oltage 5 olts 0 olts 5 olts Figure. Worksheet modification. ransfer the voltmeter to read the voltage drop across resistor # s and. 4. epeat steps 9- with the power supply adjusted to 0 and 5 volts. In each case compare the sum of the individual voltages, + +, with the total voltage,. 5. Is there a difference? If so, how much of a difference and explain. 6. Derivation of Equation () was also based on the current flowing through each resistor being the same. emove jumper,, and replace it with the ammeter. ead and record the total current, I. epeat this step for jumpers,, and 4 to measure the currents I, I, and I flowing in other parts of the circuit. 7. Compare the results to see if there are any differences. Explain any differences that are observed. Ohms Law III Series Parallel esistors.doc //08/5: PM 7

18 Ohm s Law III esistors in Series and Parallel Questions. Draw a clear, schematic diagram for the circuit shown in the photo in Figure. Figure. Draw a clear, schematic diagram for the circuit shown in the photo in Figure.. Draw a clear, schematic diagram for the circuit shown in the photo in Figure Ohms Law III Series Parallel esistors.doc //08/5: PM 8

### Physics 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 (1789-1854) 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

### Resistors 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

### Name Partner Date Class

Name Partner Date Class Ohm's Law Equipment: Resistors, multi-meters, VOM, alligator clips, wires, breadboard, batteries, 1/4 or 1/2 Amp fuse, low voltage power supply. Object: The object of this exercise

### Series 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

### R 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

### R Ω. II. Experimental Procedure. Ohm's Law

I. Theory Ohm's Law In this lab we will make detailed measurements on a resistor to see if it obeys Ohm's law. We will also check the rules for combining resistors in series and parallel. Ohm's law describes

### PHYSICS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits

PHYSCS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits This experiment is designed to investigate the relationship between current and potential in simple series

### Lab 3 - DC Circuits and Ohm s Law

Lab 3 DC Circuits and Ohm s Law L3-1 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

### Lab 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

### Background: 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

### 3 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.

### RESISTANCE & OHM S LAW (PART I

RESISTANCE & OHM S LAW (PART I and II) Objectives: To understand the relationship between potential and current in a resistor and to verify Ohm s Law. To understand the relationship between potential and

### Ohm 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

### Resistance, 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

### Circuits 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

### Electric 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

### PHY 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

### esiexperiment 1: Electrical Resistance and the Resistor

esiexperiment : Electrical Resistance and the Resistor Introduction Ohm s law is the most fundamental equation in electric circuit analysis. It states that the amount of electric current flowing in a circuit

### Ohms Law I--DC Circuits with Light Bulbs PhET Lab I with Ammeters and Voltmeters

Ohms Law I--DC 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,

### CHAPTER 2. Basic Electronics & Theory. (The rules behind all those little things)

CHAPTER 2 Basic Electronics & Theory (The rules behind all those little things) 1 Current, Voltage, Resistance Water flowing through a hose is a good way to imagine electricity. Water is like Electrons

### DC Circuits (Combination of resistances)

Name: Partner: Partner: Partner: DC Circuits (Combination of resistances) EQUIPMENT NEEDED: Circuits Experiment Board One Dcell Battery Wire leads Multimeter 100, 330, 1k resistors Purpose The purpose

### Ohm s Law. 1 Object. 2 Apparatus. 3 Theory. To study resistors, Ohm s law, linear behavior, and non-linear behavior.

Ohm s Law Object To study resistors, Ohm s law, linear behavior, and non-linear behavior. pparatus esistors, power supply, meters, wires, and alligator clips. Theory resistor is a circuit element which

### Resistors. 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

### PHYSICS 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 (volt-ohm-milliammeter), digital multimeter, power supply. 1/2 watt carbon

### Experiment 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 multi-meter to measure voltage, current and resistance. Equipment: Bread

### Series & 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,

### Lab 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

### Basic Ohm s Law & Series and Parallel Circuits

2:256 Let there be no compulsion in religion: Truth stands out clear from Error: whoever rejects evil and believes in Allah hath grasped the most trustworthy hand-hold that never breaks. And Allah heareth

### Electrical 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

### International Islamic University Chittagong Department of Electrical & Electronics Engineering

International Islamic University Chittagong Department of Electrical & Electronics Engineering Course No: EEE 1102 Course Title: Electrical Circuit I Sessional Experiment No : 01 Experiment Name: Introduction

### Experiment #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,

### Experiment 15: Ohm s Law

Experiment 15: Ohm s Law Figure 15.1: Simple Series Circuit EQUIPMENT Universal Circuit Board Power Supply (2) DMM s 150 Resistor (R 1 ) 330 Resistor (R 2 ) 560 Resistor (R 3 ) Miniature Light Bulb and

### Preview 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

### GENERAL 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.

### EXPERIMENT 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

### UNIVERSITY 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

### very 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

### PHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three- and Four-Terminal Black Boxes

PHY222 Lab 3 Ohm s Law and Electric Circuits Ohm s Law; Series Resistors; Circuits Inside Three- and Four-Terminal Black Boxes Print Your Name Print Your Partners' Names Instructions February 5, 2015 Before

### Basic 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

### Circuits-Circuit Analysis

Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9-volt battery is connected to a 4-ohm resistor and a 5-ohm resistor as shown in the diagram below. A 3.0-ohm resistor,

### Meters - 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

### 3_given a graph of current_voltage for a resistor, determine the resistance. Three resistance R1 = 1.0 kω, R2 = 1.5 kω, R3 = 2.

Ohm s Law Objectives: 1_measure the current_voltage curve for a resistor 2_construct a graph of the data from objective 1 3_given a graph of current_voltage for a resistor, determine the resistance Equipment:

### Lab 1: DC Measurements (R, V, I)

Lab 1: DC Measurements (R, V, I) Introduction Resistors are the most common component found in all electrical and electronic circuits. Resistors are found in many shapes, sizes, and values. The most common

### Microsoft Excel Tutorial

Microsoft Excel Tutorial by Dr. James E. Parks Department of Physics and Astronomy 401 Nielsen Physics Building The University of Tennessee Knoxville, Tennessee 37996-1200 Copyright August, 2000 by James

### PHYS-2212 LAB Ohm s Law and Measurement of Resistance

Objectives PHYS-2212 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 voltage-current

### Joule Equivalent of Electrical Energy

by Dr. James E. Parks Department of Physics and Astronomy 401 Nielsen Physics Building The University of Tennessee Knoxville, Tennessee 37996-1200 Copyright October, 2013 by James Edgar Parks* *All rights

### 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

### EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME - D.C. CIRCUITS Be able to use circuit theory to determine voltage, current and resistance in direct

### Introduction to Electric Circuits. Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos

Introduction to Electric Circuits Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos Electrical Circuits (Over)simplified The simple model of matter is that it is made

### Experiment #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,

### Lab 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

### Lab 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

### D.C. Circuits. 1. To determine the resistance of resistors using (a) a multimeter, and (b) Ohm s Law,

D.C. Circuits 1 Objectives 1. To determine the resistance of resistors using (a) a multimeter, and (b) Ohm s Law, 2. To verify the equivalent resistance formulae for series and parallel resistor combinations,

### Saturday X-tra X-Sheet: 19. Electric circuits

Saturday X-tra X-Sheet: 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

### RUTGERS UNIVERSITY The State University Of New Jersey School Of Engineering Department Of Electrical And Computer Engineering

1 RUTGERS UNIVERSITY The State University Of New Jersey School Of Engineering Department Of Electrical And Computer Engineering 332:223 Principles of Electrical Engineering I Laboratory Experiment #1 Title:

### OHM 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 non-ohmic

### Lab #2: Parallel and Series Resistors

Fall 2013 EELE 250 Circuits, Devices, and Motors Lab #2: Parallel and Series Resistors Scope: Use a multimeter to measure resistance, DC voltage, and current Use the color code for resistors. Use the prototype-board

### ROUGH DRAFT. Electric Fields Experiment-The Cenco Overbeck Apparatus. by Dr. James E. Parks

ROUGH DRAFT Electric Fields Experiment-The Cenco Overbeck Apparatus by Dr. James E. Parks Department of Physics and Astronomy 401 Nielsen Physics Building The University of Tennessee Knoxville, Tennessee

### 1) 10. V 2) 20. V 3) 110 V 4) 220 V

1. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R 1, and a variable resistor, R 2. 3. What is the total resistance of the circuit 1) 6.6 Ω 2) 10

### RLC Series Resonance

RLC Series Resonance 11EM Object: The purpose of this laboratory activity is to study resonance in a resistor-inductor-capacitor (RLC) circuit by examining the current through the circuit as a function

### MEASUREMENT OF RESISTORS

MEASUREMENT OF RESISTORS Richard G. Lupa Benjamin M. Cadieux 9/17/2007 Objectives: Learn how to utilize and code with the resistor color code system Learn how to use a digital multimeter (DMM) and an analog

### Experiment #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

### Name Date: Course number: MAKE SURE TA & TI STAMPS EVERY PAGE BEFORE YOU START EXPERIMENT 9. Superconductivity & Ohm s Law

Laboratory Section: Last Revised on January 6, 2016 Partners Names: Grade: EXPERIMENT 9 Superconductivity & Ohm s Law 0. Pre-Laboratory Work [2 pts] 1. Define the critical temperature for a superconducting

### Activity 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

### 8.3. Resistance and Ohm s Law. Did You Know? Resistance and the Flow of Electrons. Words to Know

8.3 Resistance and Ohm s Law Resistance slows down the flow of electrons and transforms electrical energy. Resistance is measured in ohms ( ). We calculate resistance by applying a voltage and measuring

### ElectronicsLab1.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

### EE 1202 Experiment #2 Resistor Circuits

EE 1202 Experiment #2 Resistor Circuits 1. ntroduction and Goals: Demonstrates the voltage-current relationships in DC and AC resistor circuits. Providing experience in using DC power supply, digital multimeter,

### Circuits. 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

### Intro to Circuits Lab #1

Intro to Circuits Lab #1 Anatomy of a Breadboard: The breadboard is where you will be assembling your circuits. The breadboard is composed of rows and columns of metal clips. These clips are housed in

### Section 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

### Ohm 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

### Dashboard logging data graphs. Dashboard logging data graphs How to create graphs from Dashboard logging data using MS Excel.

Dashboard logging data graphs How to create graphs from Dashboard logging data using MS Excel Introduction The TBS Dashboard for Windows software environment, offers data logging capabilities for each

### Student Exploration: Circuits

Name: Date: Student Exploration: Circuits Vocabulary: ammeter, circuit, current, ohmmeter, Ohm s law, parallel circuit, resistance, resistor, series circuit, voltage Prior Knowledge Questions (Do these

### PHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (I-V) curves

Purpose: PHYS245 Lab: Light bulb and resistor ΙΙ: Current voltage (I-V) curves Measure the current voltage curve of a light bulb and a resistor using a variable d.c. power supply. Understanding of Ohm

### ME : Electronics and Instrumentation Lab 1: Basic Resistor Circuits and DC Power

ME 530.241: Electronics and Instrumentation Lab 1: Basic Resistor Circuits and DC Power Louis L. Whitcomb and Kyle B. Reed Department of Mechanical Engineering The Johns Hopkins University Spring 2009

### EXPERIMENT #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.

### Using Excel to a Graph System of Equations

Using Excel to a Graph System of Equations Level: Goal: OBS To become familiar with Microsoft Excel and the Chart Wizard in order to create graphs of systems of equations on the computer. Learning Outcomes:

### Chapter 7 Direct-Current Circuits

Chapter 7 Direct-Current Circuits 7. Introduction...7-7. Electromotive Force...7-3 7.3 Resistors in Series and in Parallel...7-5 7.4 Kirchhoff s Circuit Rules...7-7 7.5 Voltage-Current Measurements...7-9

### Chapter 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.

### Lab 5: Simple Electrical Circuits

Lab 5: Simple Electrical Circuits Introduction: In this laboratory you will explore simple DC (direct current) electrical circuits. The primary goal of the lab will be to develop a model for electricity.

### AP* Electric Circuits Free Response Questions

AP* Electric Circuits Free Response Questions 1996 Q4 (15 points) A student is provided with a 12.0-V battery of negligible internal resistance and four resistors with the following resistances: 100 Ω,

### Ohmic 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 I-V characteristics of a fixed resistor,

### Scientific Graphing in Excel 2010

Scientific Graphing in Excel 2010 When you start Excel, you will see the screen below. Various parts of the display are labelled in red, with arrows, to define the terms used in the remainder of this overview.

### ENGR 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

### Lecture PowerPoints. Chapter 19 Physics: Principles with Applications, 7th edition Giancoli

Lecture PowerPoints Chapter 19 Physics: Principles with Applications, 7th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching

Table of Contents Graphing with Excel 1 1. Graphing Data 1.1. Starting the Chart Wizard 1.2. Selecting the Data 1.3. Selecting the Chart Options 1.3.1. Titles Tab 1.3.2. Axes Tab 1.3.3. Gridlines Tab 1.3.4.

### Kirchhoff 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

### Resistance 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

### [2]...[1] [3]

High Demand Questions QUESTIONSHEET 1 (a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P Q Calculate the current that passes through

### = 1 R 1 + (2) + 1 R R 2

PHYS 140 General Physics II EXPERIMENT 4 SERIES AND PARALLEL RESISTANCE CIRCUITS I. OBJECTIVE: The objective of this experiment is the study of series and parallel resistive circuits. The student will

### ElectronicsLab2.nb. Electronics Lab #2. Simple Series and Parallel Circuits

Electronics Lab #2 Simple Series and Parallel Circuits The definitions of series and parallel circuits will be given in this lab. Also, measurements in very simple series and parallel circuits will be

### How to create graphs with a best fit line in Excel

How to create graphs with a best fit line in Excel In this manual, we will use two examples: y = x, a linear graph; and y = x 2, a non-linear graph. The y-values were specifically chosen to be inexact

### Charge and Discharge of a Capacitor

Charge and Discharge of a Capacitor INTRODUCTION Capacitors 1 are devices that can store electric charge and energy. Capacitors have several uses, such as filters in DC power supplies and as energy storage

### REVIEW QUESTIONS. A6 Test Preparation

A6 Test Preparation Note: The lessons, exercises and tests in this manual are great preparation for taking the ASE A6 (electrical) certification test. However, that s only for the topics we ve covered.

### EE101 - Lab 2: Resistive Circuits. Resistor Color Codes --- Note: carbon composition resistors will be used

EE101 - Lab 2: Resistive Circuits ALL PRELABS ARE TO BE COMPLETED ON SEPARATE PAPER AND TURNED IN AT THE BEGINNING OF THE LAB PERIOD (MAKE A COPY TO USE DURING THE LAB). ALL LAB EXERCISES MUST BE COMPLETED

### EE301 RESISTANCE AND OHM S LAW

Learning Objectives a. Describe the concept of resistance b. Use Ohm s law to calculate current, voltage, and resistance values in a circuit c. Discuss the difference between an open circuit and a short

### Kirchhoff 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

### Measuring 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