Mathematics · Electric Circuits
A 100-W incandescent light bulb operating in a 120-V circuit is dimmed to half its original power output using an old-fashioned variable resistor (rheostat) connected in series. Assuming the bulb's resistance remains constant, how much power is dissipated by the rheostat itself?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 19.17 W
- 220.71 W✓
- 350.00 W
- 44.58 W
Correct answer
20.71 W
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