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 this lamp at room temperature?
36 Ω
2 )
580 Ω
3 )
1.5 kΩ
4 )
9.2 kΩ
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