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A filament bulb (500 W, 100 V) is to be ...

A filament bulb `(500 W, 100 V)` is to be used in a `230 V` main supply. When a resistance `R` is connected in series, it works perfectly and the bulb consumers `500 W`. The value of `R` is

A

`26Omega`

B

`13Omega`

C

`230Omega`

D

`46Omega`

Text Solution

Verified by Experts

The correct Answer is:
A

In series combination, current is same
`rArr I_(b)=(500)/(100) rArr 5A`
`I_(R )=I_(b)=5A`
`R=(V)/(I)=(130)/(5)`
`R=26Omega`
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