Jody Lewin
Lab Partner: Juliana Petritis
Lab TA: Laxman Mainali
Lab 3  Ohm’s Law
15 February 2008
Ohm’s Law
Relevant Formulas:
1.
V = IR
2.
R
series
= R
1
+ R
2
3.
1
=
1
+
1
.
R
parallel
R
1
R
2
1.
The current (I) is proportional to the potential difference (V) in Ohm’s Law.
Resistance
is measured in ohms: 1 Ohm = 1 Volt / Amp = 1 Ω.
2.
Resistance in series is the sum of the resistors in the circuit.
3.
Resistance in parallel is the reciprocal of each resistor summed up.
Procedure:
Connect the two multi meters with the resistor and power supply making it so that the
multi meter measuring voltage is parallel to the resistor and the other is in series with the resistor
to measure current.
Current is measured on the 20mA scale and voltage is measured on the 20
volt scale.
Measure 5 or more different voltagecurrent values and plot them on a graph.
Find
the line of best fit which is equal to the resistance.
For the resistor used, look at the color on the
band and determine the resistance using the Resistor Codes.
See if they match.
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 Spring '08
 Lanford
 Resistor, ohm

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