Question 443: 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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