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OpenStudy (anonymous):
A lightbulb has an efficiency of 1.8%. How much heat energy (not light energy) is generated by the bulb every second if the bulb has a power of 120 W? A. 2.16 J B. 5.98 J C. 117.8 J D. 1.22 J
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OpenStudy (ivancsc1996):
Well since the purpose of the bulb is to produce light then the efficiency of heat production is 98.2% so:\[Q=\frac{ 100-1.8 }{ 100 }120W1s=117.8J\]
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