Lab 04 - Ohm's Law and Resistance (1)

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Electrical Engineering

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May 8, 2024

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Lab 4: Ohm’s Law and Resistance Name: Fatima Aftan Determination of the Resistance of a Resistor using Ohm’s Law In this lab we are going to use Ohm’s Law to determine the resistance of a resistor and compare this experimental value with its nominal value. Please click on the following link to access the browser-based simulation you need to do this lab: https://www.thephysicsaviary.com/Physics/Programs/Labs/ OhmsLawAnalogMeters/ Procedure: 1. Press “Begin”. Write down the colors of the first three bands on the resistor from left to right on the blanks provided for it above Table 1. For example, on the resistor shown in the screenshot below, the first three band colors are red, violet, and brown. These band colors will be used to determine the nominal resistance of the resistor. Take a screenshot (Print Screen key) of your experimental set-up showing your resistor and paste it as your answer to question 1. 2. Obtain 8 pairs of readings of voltage across the resistor (Volts, lower left voltmeter) and current through the resistor (Amps, lower right ammeter). Change the voltage by clicking on the “Neveready” battery at the center of the screen and read the corresponding voltage and current measurements. Each time you click on the Neveready battery, a new battery with a AGB_DC

Lab 4: Ohm’s Law and Resistance different voltage will appear (Battery A, Battery B, etc.). Write the values of voltage and current in Table 1. IMPORTANT: You MUST change the scale of the meters if the needle is either too close to zero or at the scale’s upper limit. For example, in the screenshot above, the scale of the ammeter must be changed to a smaller scale. To change to a smaller scale, press the blue arrow pointing down located under the meter until the meter’s needle is between the zero and the scale’s upper limit. If the scale needs to be changed to a larger scale, press the blue arrow pointing up. Please keep in mind that the values for current and voltage written in Table 1 must be in amperes (A) and volts (V), respectively. 3. Now build a Voltage (V) vs Current (A) graph using the following browser-based graphing program: http://www.thephysicsaviary.com/Physics/Programs/Tools/Graphing/index.html 4. On the title of the left data column (x), write “Current (A)” [without the quotation marks, of course], and on the title of the right data column (y) write “Voltage (V)”. Now enter the values from Table 1 into the browser-based graphing program. NOTE: You must enter the scientific notation into this browser-based graphing program as, for example, 5.4e-9, instead of 5.4x10^-9. 5. After you enter the 8 data pairs of voltage and current values, press the “Curve Fit” button and click on “Linear”. 6. Make a screenshot (Print Screen key) of your screen showing the graph with the curve fit and the data. You will paste this screenshot as your answer for question 2. 7. Look for the slope of the curve fit equation (the coefficient of x). This is the experimental value of the resistance R of the resistor. Write this value in the blank provided for it below Table 1. 8. Use the guide on how to read resistor color codes on the right to determine the nominal resistance of your resistor R n and write this value on the blank provided for it above Table 1. NOTE: AGB_DC

Lab 4: Ohm’s Law and Resistance Do not use the last band (left to right), which corresponds to the tolerance. Use only the first three color bands. Name: Fatima Aftan EXPERIMENTAL DATA SHEET Table 1 . Band Colors on Resistor (left to right): 1 st : Brown 2 nd : Blue 3 rd : Brown Nominal Resistance R n : 160 ohms Voltage (V) Current (A) 13.5 8.5 x 10 -2 12 7.5 x 10 -2 10.5 6.5 x 10 -2 8.7 5.5 x 10 -2 7.5 4.75 x 10 -2 6.5 4 x 10 -2 4.0 2.5 x 10 -2 2.5 1.5 x 10 -2 AGB_DC

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