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IUPUI PHYS 251 LAB
Page 1 of 2
ELECTRIC POWER
OBJECTIVE
To understand electric power distribution in simple seriesparallel circuits
EQUIPMENT
battery eliminator, 5 identical miniature light bulbs (with mounts), patch cords,
connectors (alligator or fork shaped)
THEORY
•
Ohm’s Law for resistors is
V
=
IR
, where
I
is its current,
R
is its resistance,
and
V
is its voltage (difference).
•
The electric power for any dc circuit component is given by
P=IV
.
•
Each series resistor has the same current and a power
P
=
I
(
IR
) =
I
2
R
.
•
Each parallel resistor has the same voltage and a power
R
V
V
R
V
P
2
=
⎟
⎠
⎞
⎜
⎝
⎛
=
.
•
The brighter the light bulb, the greater its power consumption.
PROCEDURE
Set the battery eliminator at 3 VDC. Connect each mounted light bulb to the
battery eliminator, one at a time, and note the brightness. This represents the
“baseline” power level for each bulb. In the following expressions, P1 refers to
the power of bulb 1, P2 to the power of bulb 2 and so on.
LAB ASSIGNMENT:
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 Spring '08
 Turner
 Power, Light

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