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Lab #34.1
Electricity & Magnetism:
Ohm, Ohm on the Range
Purpose
In this
experiment, students will
arrange a simple circuit
involving a power source and a
resistor. They will attach an
ammeter and a voltmeter to the
circuit. They will measure
corresponding values of current
and voltage in the circuit. They
will then interpret observations
to find the relationship between
current, voltage, and
resistance.
Discussion
The current,
voltage, and resistance in
an electric circuit are
related to one another in a
very specific way. Designers
of electric circuits must
take this relationship into
account or their circuits
will fail. This relationship
is as important and
fundamental in electricity
as Newton’s second law of
motion is in mechanics. In
this experiment, you will
determine this relationship
Required Equipment
Variable DC power
supply (0–6 V), 2 power
resistors with different
resistances (values between 3 Ω
and 10 Ω recommended), power
resistor with unknown resistance
(for the Going Further section
of experiment), miniature light
bulb in socket (14.4-V
flashlight bulb recommended), DC
ammeter (0–1 A analog
recommended), DC voltmeter (0–10
V analog recommended), 5
connecting wires, graph paper
Download
Student Worksheet
Teacher Notes
Return to Lab Menu
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Power
Resistors |
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The "Graph
Paper" required for this lab is
readily available at your office
or school supply store. Each lab
group would need access to
enough for each student. See lab detail for
specific use. |
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