Calculate power using work done divided by time.

Power is the rate at which work is performed. It tells how quickly energy is transferred or used. The formula is P = W ÷ t, where P is power in watts (W), W is work done in joules (J), and t is the time taken in seconds (s). For example, if a 100‑J lift is completed in 20 s, the power is 100 J ÷ 20 s = 5 W. Power is useful for comparing devices: a 200‑W bulb uses the same energy as a 100‑W bulb but does so twice as fast, so its power is higher. This calculation helps students understand the relationship between work, time and energy transfer in everyday situations.