Ohm’s Law & Resistive Circuits – 2007c
Equipment: Circuit Board, Power Supply, Connective Wires, (2) Multimeters.
A. Series Resistive Circuit
1) Individually measure the resistance of three different resistors.
R1 = ______________
R2 = ______________ R3 = _______________
2) Connect these resistors in series and measure the series resistance.
Measured Series Resistance = ______________
R1 + R2 + R3 = ______________
3) Connect the series circuit to the Power Supply (set at 1V). Insert the Ammeter into the
circuit at four different locations. Record each current measurement.
I1 = ___________ I2 = ___________ I3 = ___________ I4 = ___________
B. Parallel Resistive Circuit
4) Individually measure the resistance of three different resistors.
R1 = ______________
R2 = ______________ R3 = _______________
5) Connect these resistors in parallel and measure the parallel resistance.
Measured Parallel Resistance = ______________
(1/R1 + 1/R2 + 1/R3)-1 = ______________
6) Connect the parallel circuit to the Power Supply (set at 1V). Insert the Ammeter into the
circuit at four different locations. Record each current measurement.
I1 = ___________ I2 = ___________ I3 = ___________ I4 = ___________
C. Ohm’s Law
1) Choose one resistor to work with. Measure its resistance with the multimeter and record
the value.
R = ________________
2) Connect the resistor by itself with the Power Supply.
3) Insert the ammeter into this circuit.
4) Set the Power Supply to 1.0V. Measure and record the current in amperes.
5) Repeat for next higher voltage settings.
6) Calculate the measured V/I values.
7) Compute the average of the V/I values _______________
8) Calculate the percent difference in average(V/I) and the multimeter measurement from
part (1).___________
V-setting (volts)
1.0
2.0
3.0
4.0
5.0
6.0
Measured I (amps)
Measured V/I (V/A)