An electric bulb rated for 500 W at 100 ...

An electric bulb rated for `500 W` at `100 V` is used in a circuit having a `200 V` supply. The reistance `R` that must be put in series with bulb, so that the bulb delivers `500 `W is ……….`Omega`.

`18Omega`

`20Omega`

`40Omega`

`700Omega`

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An electric bulb rated for 500W at 100V is used in circuit having 200V supply. Calculate the resistance R that must be put in seires with the bulb, so that the bulb delivers 500 W.

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