Question

Which of the following best expresses power? A. Power is work.
B. Power is the rate at which work is done.
C. Power is determined by mass.
D. Power is determined by work and mass.

Answer 1

B because power is the rate of doing work.

Answer 2

Answer: option B: Power is the rate at which work is done.

Explanation:

Power can be defined as the amount of work done or amount of energy transferred in a unit time.

$P = \frac{W}{t}$

Its unit is J/s.

SI unit of power is kg⋅m²⋅s⁻³

Hence, the best expression of power out of the given options is rate at which work is done. Option B is correct.