How much energy does a 2,400 watt machine use in 3 minutes?

800 J

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7,200 J

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432,000J

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24 J

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13.3 J

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Solution

The correct option is B 432,000J
Power of the machine $P = 2400$ watt
Time for which the machine is used $t = 3$ minutes $= 180$ seconds
Thus energy consumed $E = P \times t = 2400 \times 180 = 432, 000$ J

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