For the circuit shown in Figure P2.24, determine which components are supplying power and which are dissipating power. Also determine the amount of power dissipated and supplied.
+ 2 V _
2.29 A GE SoftWhite Longlife lightbulb is rated as follows:
+ PR = rated power = 60 W
3 V POR = rated optical power = 820 lumens (lm) (average)
_ 1 lumen
Operating life = 1,500 h (average)
VR = rated operating voltage = 115 V
The resistance of the filament of the bulb, measured with a standard multimeter, is 16.7 Q. 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.
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