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NOL PHY 202
Lab – Ohm’s Law
(40 total points)
Name: __________________________
Before starting, please scroll through the worksheet to check the page numbers and get
all the information. Complete all activities before submitting the lab.
Do not delete the content and highlight your answers in yellow.
Goal:
●
Experimentally validate Ohm’s Law: V= IR, where V is the potential difference across
the resistor, I is the current measured in amps flowing through the resistor, and R is
the resistance in Ohms.
Required Tools:
This lab uses the Ohm’s Law simulation provided by PhET at the University of Colorado
Boulder.
You need to use a graphing application such as Microsoft Office Excel.
Experimental Procedure:
You will perform two experiments. The first is to determine how current varies with voltage
across a fixed resistance (Part A) and the second is to determine how the current varies as the
resistance changes with a fixed voltage. (Part B)
Part A: Variation of Current with Voltage (Resistance Constant)
1. Set the resistance =350 and adjust the voltage to 1.5 V. Then read and record the
current value in
table 1 below.
2. Record the measured current (I) for the other voltages in the table (3.0 V, 4.5 V, …. 9V).
3. Repeat the steps 1 and 3 for 650 and 950 resistors and record the results in table 1.
Table 1
Resistance R1 = 350 Ω
Reading
1
Given
Voltage, V
(Volt)
1.5
2
3
3.0
4.5
Measured
Current, I
(mA)
Resistance R2 = 650 Ω
Resistance R3 = 950 Ω
Given
Voltage, V
(Volt)
1.5
Given
Voltage, V
(Volt)
1.5
3.0
4.5
3.0
4.5
Page 1 of 3
Measured
Current I
(mA)
Measured
Current, I
(mA)
NOL PHY 202
4
5
6
(9 points)
6.0
7.5
9.0
6.0
7.5
9.0
6.0
7.5
9.0
Part B: Variation of Current with Resistance (Voltage Constant)
1. Switch the circuit back to default by clicking the reset button.
2. Adjust the source voltage to 4.5 V (Leave this fixed through-out the experiment).
3. Adjust the R = 350 and record the current corresponding to that resistance in table 2
below.
4. Adjust resistance to 450 Ω. Record the current reading.
5. Repeat the steps 3 and 4 for all resistor values indicated in table 2.
6. Calculate the Inverse of the resistance (1/R) for all resistances and record them in the
table.
Table 2:
Voltage Vs = 4.5 (V)
Reading
Resistance of the
Resistor, R ( )
1
350
2
450
3
550
4
650
5
750
6
850
Current reading, I
(mA)
Inverse of the
Resistance
(1/ ) ( −1 )
(6 points)
Data Analysis and Conclusion
1. Prepare a plot of the data from table 1 showing potential difference across the resistor
versus current flowing through the resistor using Microsoft Office excel. You may
show all three sets of data for the resistance values R1, R2, and R3 on the same plot. Fit
the data with linear best fit trend line and display equation on the graph for each resistor.
Determine the slope of each plot. The slope of the line should be equal to the value of
the resistance. Record the value of the slope found for each data set below and record
the percent error compared to given resistance values R1, R2 and R3.
R1 = _____________ (SI units)
% Error = _______________________
Page 2 of 3
NOL PHY 202
(Show your work for % error calculation)
R2 = _____________ (SI units)
% Error = _______________________
Rx = _____________ (SI units)
% Error = _______________________
(9 points)
NOTE: When you plot graphs, make sure all physical quantities must be in SI
units.
2. Prepare a plot of the data from table 2 showing the current flowing through the resistor
versus the inverse of the resistance of the resistor (1/R) using Microsoft Office excel.
Fit the data with linear best fit trend line and display equation of best fit line on the graph.
What is the slope of the line? (1 point)
Compare it with the constant value of Vs using percent error. According to Ohm’s law,
these values should be equal, are they? Provide a brief explanation with the percent
error for your answer (3 points)
3. Do the experimental data confirm that the electric current flowing through the resistor is
directly proportional to the electric potential difference across the resistor provided by the
batteries? Explain clearly. (2 points)
4. Do the experimental data confirm that the electric current flowing through the resistor is
inversely proportional to the Resistance for a fixed electric potential difference across the
resistor? Explain clearly.
(2 points)
5. Copy and paste both graphs from Table 1 and Table 2 to the word document. (8 points)
Page 3 of 3
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