A current of 0.4 A flows through a resistance of 10 ohms for half an hour. Find the amount of electrical energy consumed by the resistance.

0.6

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0.7

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0.8

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0.9

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Solution

The correct option is C $0.8$ J
Given, $I = 0.4 A, R = 10 Ω$
$V = I \times R$
$= 0.4 \times 10 = 4 V$
$P = V \times I$
$= 4 \times 0.4 = 1.6 W$
$E = P \times t$
$= 1.6 \times \frac{30}{60} = 0.8 J$

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