Swap to an LED — Double Up

Quick quiz

These ask about details you only notice by really doing the task. Get every one right to pass.

1. 1. You opened the curtains instead of using lights. When does that save the least?

   Around middayOn a dark, overcast late afternoonOn a bright morningWhen the room faces the sun

2. 2. Lowering the thermostat by 1°C typically cuts heating energy by about…

   Less than 0.5%5–10%Nothing — it only saves moneyAbout 50%

3. 3. Why should you decide what you want before opening the fridge?

   Cold air spills out and the fridge works to cool down againThe light bulb overheatsFood spoils instantly when exposedIt resets the thermostat

4. 4. After unplugging idle chargers, which device usually still draws standby power when left plugged in?

   A TV or console with a standby lightA wooden lamp switched off at the wallA battery-free wall clockA disconnected extension cord