27. Resistors & DC Circuits
Power in Circuits
Multiple Choice
Multiple ChoiceAn incandescent lightbulb produces 100 W of light. If this lightbulb operates at 25% efficiency (meaning that out of all the power it generates, only 25% is released as light), what resistance must the lightbulb have if it operates at 120 V?
A
36 Ω
B
144 Ω
C
576 Ω
D
5.76 × 106 Ω
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