Question 422: Current Electricity

Question

An electric bulb is rated $220$ volt - $100$ watt. The power consumed by it when operated on $110$ volt will be

Accepted Answer

The resistance of the bulb is $R = {{{V^2}} \over P} = {{{{\left( {220} \right)}^2}} \over {100}}$
The power consumed when operated at $110$ $V$ is
$P = {{{{\left( {110} \right)}^2}} \over {{{\left( {220} \right)}^2}/100}} = {{100} \over 4} = 25\,W$

Answer

$75$ watt

Answer

$40$ watt

Answer

$25$ Watt

Answer

$50$ Watt

Current Electricity

An electric bulb is rated 220 volt - 100 watt. The power consumed by it when operated on 110 volt will be

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