Question

Calculate the energy used by a radio of power 30W in 1 minute.

Answer 1

1800 joule (1.8kJ)

Step-by-step explanation:

Formula:

Power = Work / Time

30 = Work / 60

Work = 1800 joule

Work = 1.8kJ

Energy = Work done = 1.8kJ

Hence, Energy used is 1.8kJ.

Answer 2

1.8kJ

Step-by-step explanation:

Formula :

Energy used = Power x time

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Given :

⇒ Power = 30 W

⇒ Time = 1 minute = 60 seconds

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Solving :

⇒ Energy used = 30 W × 60 s

⇒ Energy used = 1,800 J

⇒ Energy used = 1.8kJ