Home Physics Current Electricity Electric Conduction, Ohm's Law, Electric Current, Potential Deffrence The resistance of an incandescent lamp is
Physics Current Electricity Electric Conduction, Ohm's Law, Electric Current, Potential Deffrence MCQ (Single Correct)

The resistance of an incandescent lamp is

A
Greater when switched off
B
Smaller when switched on
C
Greater when switched on
D
The same whether it is switched off or switched on

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Text Solution

Verified by Experts
The correct answer is:
C

; where Relaxation time.
When lamp is switched on, temperature of filament increase, hence decrease so R increases

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