Power Flashcards – Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028)

What is power?

The rate at which work is done or energy is transferred.

What are the equations for average power in terms of work done $W$ or energy transferred $\Delta E$ over time $t$?

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

How are work done and energy transferred related?

Work done is a measure of energy transferred.

What is the unit of power, and what is it equivalent to?

The watt (W): $1\,\text{W} = 1\,\text{J/s}$.

For a fixed amount of energy transferred, how does a shorter transfer time affect power?

It increases the power.