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An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply ?

Current Electricity

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Answer

Given,

Power (P) = 100 W

Voltage (V) = 250 V

From relation,

Power (P) = VI

Substituting the values in the formula above, we get,

100=250×I⇒I=100250⇒I=0.4A100 = 250 \times I \\[0.5em] \Rightarrow I = \dfrac{100}{250} \\[0.5em] \Rightarrow I = 0.4 \text {A}

Hence, current drawn = 0.4 A

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