The resistance of the filament of the bulb, measured with a standard multimeter, is 16.7 ?. When the bulb is connected into a circuit and is operating at the rated values given above, determine a. The resistance of the filament. b. The efficiency of the bulb.
A GE SoftWhite Longlife lightbulb is rated as follows:
PR = rated power = 60 W
POR = rated optical power = 820 lumens (lm) (average)
1 lumen =
Operating life = 1,500 h (average)
VR = rated operating voltage = 115 V
What will be an ideal response?
Known quantities:
Rated power; rated optical power; operating life; rated operating voltage; open-circuit resistance of the filament.
Find:
a) The resistance of the filament in operation
b) The efficiency of the bulb.
Analysis:
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