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Durham University


Energy Quiz Answers

1) True or false: Screen savers reduce a computer’s energy use.

False. Always remember to turn off your screen/monitor when away from your desk.

2) True or false: Having a charger plugged in with no device attached uses energy.

True. Always switch off chargers as soon as the device is fully charged.

3) If everyone in the UK boiled only the water they needed every time they used the kettle, we could save enough electricity in a year to run the UK’s street lighting for how long?

7 months. (The Energy Saving Trust, 2009)

4) Leaving a colour LCD television on standby overnight releases the same CO2 emissions as making how many cups of tea?

750 cups of tea! Make sure you fully turn off all non-essential appliances after use.

5) Put the below in the order of energy use – starting with the lowest.

B, A, C

b) Using a phone charger for one hour: 5w x 1 hour = 0.005kwh

a) Using a toaster for 3 minutes: 800W x 0.05hours = 0.040 kwh

c) Boiling a kettle for 2 minutes: 2500w x 0.03 = 0.083 kwh

6) How much energy could be saved annually by showering for one minute less (based on having an electric shower once a day every day)?

55kwh – equivalent to the energy needed to make 925 cups of tea!

One minute = 9000w x 1 minute = 0.15kwh x 365 days = 54.75kwh

7) True or false: Leaving a computer on overnight for a year creates enough CO2 to fill a double-decker bus.

True. Fully shut down computers and laptops overnight. (The Carbon Trust, 2013)

8) If everyone in the UK switched off unused appliances in their home, how much would it save each year?

C - £800 million. Make sure you switch off all unused appliances whenever possible to save energy and money! (Act on CO2, 2010)

9) Reducing heating temperatures by just 1°C can cut fuel consumption by how much?

8-10% (Carbon Trust, 2014)

10) If every household in the UK switched off and avoided standby, how many Wembley Stadium’s full of carbon dioxide could be saved every year?

23 Wembley Stadiums (Energy Saving Trust, 2013)