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The resistance of tungsten filament is a...

The resistance of tungsten filament is about `10` times the cold resistance. What will be the resistance of `100 W and 200 V` lamp when not in use?

A

`40Omega`

B

`20Omega`

C

`400Omega`

D

`200Omega`

Text Solution

Verified by Experts

`P=V^2//R therefore R_(hot)=V^2/P=(200 times 200)/100=400Omega implies R_(cold)=400/10=40 Omega`
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