Power

P=\dfrac{W}{t}=Fv

Result unit: W (watt)

What it describes

The rate of doing work — the work done per unit of time.

P

power

[W]

W

work

[J]

t

time

[s]

F

force

[N]

v

speed

[m/s]

Power tells you how fast work is being done — the same work done in a shorter time means greater power. For a constant force,

P=Fv

Comparing the rate at which work is done (engines, devices). 1 hp ≈ 735 W.

A motor does 6000 J of work in 3 s. Find its power.

Substitution

W=6000

t=3

Result

P=\dfrac{6000}{3}=2000

=2

kW.

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