Practice question · Multiple choice
Work and energy share the joule while power takes the watt. What does that difference in units record?
Hints
- Write the watt in terms of joules and seconds.
- Two people lift the same box, one twice as fast.
Show the answer
D. That power is energy per unit time, so it is a rate
Why
A rate and an amount are different quantities. This is why an engine is rated in watts and a battery in joules, one is how fast, the other is how much.
Practise Work, Energy, and Power
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