Question 369: Current Electricity

Question

A $$220$$ volt, $$1000$$ watt bulb is connected across a $$110$$ $$volt$$ mains supply. The power consumed will be

Accepted Answer

We know that $$R = {{V_{rated}^2} \over {{P_{rated}}}} = {{{{\left( {220} ight)}^2}} \over {1000}}$$
When this bulb is connected to $$110$$ volt mains supply we get
$$P = {{{V^2}} \over R} = {{{{\left( {110} ight)}^2} 	imes 1000} \over {{{\left( {220} ight)}^2}}} = {{1000} \over 4} = 250W$$

Answer

$$750$$ watt

Answer

$$500$$ watt

Answer

$$250$$ watt

Answer

$$1000$$ watt

Current Electricity

A $220 volt, 1000 watt bulb is connected across a 110 volt$ mains supply. The power consumed will be

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