Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 33

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?

1. A36 Ω
2. B580 Ω
3. C1.5 kΩ
4. D9.2 kΩ

As printed in the paper