Mathematics · Electrical Networks
A 100 W, 200 V incandescent lamp's filament operates at 2000 °C under normal conditions. If the filament material has a temperature coefficient of resistance of 0.005 °C-1 at 30 °C, what would be the current at the instant of turning on the bulb at an ambient temperature of 30 °C?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 15.00 A
- 20.54 A
- 30.50 A
- 45.43 A✓
Correct answer
5.43 A
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