Energy saving quiz
Small changes, smaller bills. How energy-smart are you?
10 multiple-choice questions, with the answer explained after each one.
Answer each question, see why, and beat your best score.
All 10 questions and answers
Want to check an answer or run the quiz out loud? Every question is here, with the answer hidden until you open it.
- Compared with old incandescent bulbs, LED globes use…
- About 10% less
- Twice the energy
- About 75–80% less energy
- The same energy
Show answer
About 75–80% less energy. LEDs also last far longer.
- On an Energy Rating Label, more stars mean…
- Older model
- Bigger appliance
- More energy-efficient
- More expensive to run
Show answer
More energy-efficient. Compare stars for appliances of similar size.
- What heating temperature is commonly recommended for winter?
- 28–30 °C
- 18–20 °C
- 12–14 °C
- 24–26 °C
Show answer
18–20 °C. Each degree warmer can add noticeably to costs.
- What cooling temperature is commonly recommended for summer?
- 25–27 °C
- 30 °C
- 15 °C
- 18–20 °C
Show answer
25–27 °C. Fans use far less energy than air conditioners.
- Energy used by devices switched off but still plugged in is called…
- Solar power
- Base load
- Peak power
- Standby power
Show answer
Standby power. Turn things off at the wall.
- Washing clothes in cold water instead of warm…
- Makes no difference
- Saves energy, because heating the water uses most of it
- Uses more power
- Damages clothes
Show answer
Saves energy, because heating the water uses most of it. Most modern detergents work well in cold water.
- Which usually costs the least to dry clothes?
- A heat-pump dryer
- A vented dryer
- A clothesline
- An oven
Show answer
A clothesline. Sunshine is free.
- Your electricity bill measures energy in…
- Kilowatt-hours (kWh)
- Kilograms
- Amps
- Volts
Show answer
Kilowatt-hours (kWh). A 1,000 W heater running for 1 hour uses 1 kWh.
- Sealing draughts around doors and windows mainly…
- Reduces noise only
- Keeps heated or cooled air inside
- Increases humidity
- Lets in fresh air
Show answer
Keeps heated or cooled air inside. Draught stoppers are a cheap fix.
- A 2,000 W heater running for 3 hours uses how much energy?
- 3 kWh
- 6 kWh
- 600 kWh
- 2 kWh
Show answer
6 kWh. 2 kW × 3 h = 6 kWh.
Try the appliance running cost calculator →