A-LevelPhysicsD.C. circuits9702/12 · May/June 2017 · Q331 Mark
The filament of a 240 V, 100 W electric lamp heats up from room temperature to its operating temperature. As it heats up, its resistance increases by a factor of 16. What is the resistance of the filament at room temperature?
A36 Ω
B580 Ω
C1.5 kΩ
D9.2 kΩ
✓ Correct answer
A: 36 Ω
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