The energy consumed in 1 kilowatt electric heater in 30 seconds will be

6 \times 10^{2} J

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4. 99 \times 10^{7} J

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9.8 \times 10^{6} J

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3 \times 10^{4} J

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Solution

The correct option is B $3 \times 10^{4} J$

Given,
Power of electric heate $P = 1 K W = 1000 W$
Time to use $t = 30 s$
Energy consumed $E = ?$

we know $P = \frac{E}{t}$

$E = P \times t = 1000 W \times 30 s e c = 3 \times 10^{4} J$

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