Lesson: Chapter 18 — Work, Energy and Power

18.3. Power 5 of 7 Reset answers

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Question 5

How much work does a machine with a power of 100 W do in one minute?

A 60 J B 1.67 J C 6000 J D 100 J

The right answer is the one marked above.

6000 J. One minute is 60 s. work = power × time = 100 J s^-1 × 60 s = 6000 J.

Watch the units cancel: J s^-1 multiplied by s leaves J. If the units of your answer are not the units the question asked for, the formula was arranged the wrong way round.

Answer the question to continue.