PHY134 Ohms Law
PHY134  Classical Physics II
Laboratory
Ohm's Law
CurrentVoltage Relationships and Resistance.
In this experiment you will measure electric current as a function of voltage for two different resistors
and for a light bulb. You will also measure the voltage and current for the two resistors connected in
series and in parallel. A current vs. voltage plot is called the
IV characteristic
of the device. Ohm's Law
is satisfied when the
IV
characteristic is a straight line. The resistance
R
is defined as the ratio of the
applied voltage
V
and the resulting current
I
:
R = V / I
(Ohm's Law),
(1)
where
V
is expressed in Volts (V), the current in Amperes (A), and the unit for
R
is the Ohm (
Ω
=V/A).
Equipment
●
Power supply,
●
Circuit board,
●
Voltmeter,
●
Ampere meter.
Method
The voltage across each device to be studied is varied by changing the output of a power supply (see
Figure). Voltages and corresponding currents are measured by meters.
CAUTION: Check your circuit
to make sure it is correctly wired. Set your meters to their least sensitive (
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 Spring '08
 Gurvitch,M
 Current, Resistance, Light, Resistor, ohm, power supply

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