Experiment 4
Experiment 4.
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
defined as the ratio of applied voltage
V
to the
resulting current
I
,
R = V / I
(Ohm's Law),
where
V
is expressed in Volts, the current in Amperes, and the unit for
R
is the Ohm (
Ω
).
Equipment
●
Power supply,
●
Circuit board,
●
Voltmeter,
●
Amper 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 (
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '04
 Rijssenbeek
 Physics, Current, Resistance, Light, Resistor, power supply, Electrical resistance

Click to edit the document details