Exam-style question
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If the equation for power is P = W / t, what are the units of W if P is in Watts and t is in seconds?.
- A.Joules
- B.Newtons
- C.Kilograms
- D.Meters
Model answer
What a good answer should say
- Joules
Explanation
Why this works
In the equation P = W / t, if power (P) is in Watts (W) and time (t) is in seconds (s), then work (W) must be in Joules (J) to maintain unit consistency, since 1 W = 1 J/s.
Common mistake
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