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Lightbulb resistance and efficiency

Author:
November 16th, 2022

A GE Softwhite lightbulb is rated as follows:

rated power = 60 W ;
rated optical power = 820 lumens (lm)
1 lm = 1/680 W
operating life = 1.5 h
rated operating voltage = 115 V

The resistance of the filament of the bulb, measured with a standard multimeter is 16.7 ohms. When the bulb is connected into a circuit and is operating at the rated values given above, determine the resistance of the filament and efficiency of the bulb.

***answer should be 220.4 ohms and 2.009%*** I didn’t get the same answer…

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