Watts & Kilowatt-hours

Power versus energy

An interactive lesson with 6 steps, about 5 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 (W) is a rate. Energy (J or kWh) is power × time.
• 1 kWh $= 3.6 \times 10^6$ J.
• A human runs at roughly 100 W.

Steps

1. Rate versus amount
2. A cup of tea
3. Human power
4. An electric shower
5. Energy is area
6. Standby