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Electrical Engineering

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Apr 3, 2024

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Trevor Davis College of Technology 2022 EET113 Electric Circuits I Unit 1 Lab 2 Ohm’s Law I. Objective : 1. Build a simple electric circuit. 2. Measure voltage drop across a resistor 3. Verify the validity of Ohm’s law II. Parts List : 1. Resistors: 1 k , 3.3 k  and 10 k  2. Variable Power Supply III. Procedures : 1. Connect and simulate the circuit, shown below in Figure 1, in MultiSim. R1 10kΩ V1 10V Figure 1 A simple electric circuit 2. Measure the voltage across the power supply, V s = ___10v____ 3. Measure the voltage across the 10kΩ resistor, V R = ___10v____ 4. Increase the voltage of the power supply in steps of 2V, starting from zero till 10V, and tabulate your voltage measurements across the resistor in Table 1 below. 5. Repeat for different resistor values Table 1 Voltage drop across the resistor for different supply values R 1 = 10 kΩ R 1 = 3.3kΩ R 1 = 1kΩ Power supply Voltage, V s (V) Voltage across R, V R (V) Voltage across R, V R (V) Voltage across R, V R (V) 0 0 0 0 2 2 2 2 4 4 4 4 6 6 6 6 8 8 8 8 10 10 10 10 1
Trevor Davis College of Technology 2022 6. Connect an ammeter in the circuit to measure the current flowing through the resistor as shown below in Figure 2. You can use DMM in current measurement mode too. R1 3.3kΩ V1 12V Ammeter 0.000 A + - Figure 2 A simple electric circuit to measure current through the resistor 7. Measure the current through the 10kΩ resistor, I R = ___1.2 MA____ 8. Increase the voltage of the power supply in steps of 2V, starting from zero till 10V, and tabulate your current measurements through the resistor in Table 2 below. 9. Repeat for different resistor values 10. Plot the I-V relationship for each resistor. You can Excel for I-V plot too. Table 2 Current through the resistor for different supply values R 1 = 10 kΩ R 1 = 3.3kΩ R 1 = 1kΩ Power supply Voltage, V s (V) Current through R, I R (V) Current through R, I R (V) Current through R, I R (V) 0 0 0 0 2 .2 .606 2m 4 .4 1.212 4m 6 .6 1.818 6.001m 8 .8 2.424 8.001m 10 .998 3.03 0.01m IV. Assignment: 1. Submit your lab report to your instructor following the template available in your course shell. 2. In your lab report, make sure to address your measurements and conclusions regarding: i. Any differences between the recorded measured values for the current and the calculated ones, if any. ii. Plot the I-V relationship for each resistor. iii. Calculate, from the slope of the plot, the resistor value. Compare to the resistor’s nominal value. iv. Include a couple of screen shots of your measurement in Multisim in your lab report. 2
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