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Salt Lake Community College
Electrical Engineering Department
EE 1010 / EE2210
Introduction to Ohms Law
Latest revision 8/8/2013 by Harvey Wilson, Anton Shpakovskiy
Introduction
The relationship between Voltage and Current in a resistor needs to be
experienced, thought about, and then summarized. That was done over one hundred
years ago by Georg Ohm. His summary became known and Ohm’s Law. Today’s
experiment repeats some of his work with today’s tools.
Objectives
1. Identify the relationship between Voltage, Current, and Resistance.
2. Use that discovered relationship to predict future results, test your prediction,
confirm or revise your discovery
Experiment
Construct the circuit of Figure 1 in Multisim. Make required measurements, then plot,
then comment.
Construct the circuit of Figure 1 using a protoboard and resistor and two digital meters.
Make required measurements, then plot, then comment.
Plot Resistor I vs. V
Construct the circuit shown in Figure 1 with the voltage source (V1) initially set to
0 volts and off. Set the volt meter (XMM1) to the 20 volts range. Set the amp meter
(ammeter) (XMM2) to the 200 mA range.
Prepare to record the voltage across the resistor and the resulting current
through the resistor as the voltage source is set to various values. The set of
recorded values will be used to create a plot of current through the resistor vs.
voltage across the resistor. The file Plot_I_V.xls (provided) may be used to plot.
Set the voltage source to each of the values listed in table below, and record the
resistor voltage and current which results.
Plot the set of values, and then look for a pattern in the data or plot.
Discuss your observation(s).
Page 1 of 2
Figure 1 Voltage source, Resistor, Voltmeter, Ammeter
XMM1
V1
1V
R1
100ohm
XMM2
Figure 2 Source object prepared for simulation.
Figure 3 Plot results using Plot_I_V.xls or another method, then comment
Page 2 of 2