Watt Wise
Plan an evening at home without tripping the fuse or blowing the energy budget. Compare old and efficient appliances and learn what watts and kWh mean.
Add up the watts
The fuse trips if everything running at once draws more than 3,000 watts. Switch on the kettle, the lights and the television. Add up the watts: will it hold?
- Kettleneeded · 0.3 hours a day0 W0.00 kWh a day
- Four lightsneeded · 5 hours a day0 W0.00 kWh a day
- Televisionneeded · 4 hours a day0 W0.00 kWh a day
- Laptopoptional · 3 hours a day0 W0.00 kWh a day
- Phone chargeroptional · 3 hours a day0 W0.00 kWh a day
Power (watts) is how fast energy is used right now. Energy (kilowatt-hours) is power × hours, which is what an electricity bill counts. Numbers are typical, rounded values.
The science behind it
Read these after a few missions.
Power and energy: what the watts on a label mean
A kettle is 2,000 watts and a phone charger is 5. Find out what a watt is, how kilowatt-hours add up on a bill, and why LED bulbs save so much.
Electrical safety: why the wall socket is not a toy
Batteries are gentle but mains electricity is not. Learn why fuses and earth wires exist, how to spot danger and the rules that keep you safe.
Using Watt Wise in class
Mission 1 practises adding watts, because powers simply add when devices run together. Mission 2 is about the fuse: it limits power at one moment. Missions 3 and 4 move to energy, power × time, where an always-on fridge can matter more than a short, powerful kettle. Mission 5 uses both limits together. The values are typical rounded figures, so students can compare them with the labels on real appliances at home. Read the power and energy lesson.