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An electric bulb rated for 500 watts at ...

An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200 volts supply. The resistance R that must be put in series with the bulb, so that the bulb delivers 500 watt is ………ohm.

A

`10 Omega`

B

`20 Omega`

C

`50 Omega`

D

`100 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Rated current `i=500/100 = 5 A`
`therefore R = 100/5 = 20 Omega`
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