Question

electric bulb is rated 500 Watt to 200 volt calculate the magnitude of current it can draw

Answer 1

$p = vi \\ 500 = 200 \times i \\ i = 2.5 \: ampere$
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Answer 2

$\: \: \: \: \: \: \: \: \: V = \frac{W}{Q} \\ = >V = \frac{Pt}{Q} \: \: \: \: \: \: (P = \frac{W}{t} ) \\ = > V = \frac{Pt}{tI} \: \: \: \: \: \: (I = \frac{Q}{t}) \\ = > V = \frac{P}{I} \\ = > I = \frac{P}{V} \\ = > I = \frac{500}{200} = 2.5A.$





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