Question

what are the three measurements you need to make in order to calculate power

Answer 1

Power is defined to be \(\large{\frac{W}{t}}\)

Answer 2

W is work and t is time. And so you need to measure for how long work is being done.

Answer 3

And measure work.

Answer 4

But work is \(\large{Fd}\). The force F aplied through a distance d.

And so you need to measure the force applied and the distance through which that force acted too.

Answer 5

\(t\)
\(F\)
\(d\)

Answer 6

Another way of expressing power is the amount of energy used or generated in a given time.

Power = energy/ time to produce that energy.

for example the power of an electric heater or a laser pulse. force is not a factor in these cases.