Question 349: 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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