Power

How fast energy flows

An interactive lesson with 8 steps, about 7 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Power $P = W/t$, measured in watts (1 W = 1 J/s).
• Energy $= P \times t$. 1 kWh = 3.6 MJ.
• Same work done faster means more power.

Steps

1. Run or walk
2. Power
3. Stair power
4. Kettle
5. The kilowatt-hour
6. Heater bill
7. A powerful sprint
8. Zero to 100