Lesson T1.2.3

T1.2.3 Domestic fuel bills and costs Quiz: KS3 Physics, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T1.2.3, Domestic fuel bills and costs: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 1: Energy, written with Revision Ninja.

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The 20 questions

  1. Domestic electricity is usually charged for by which unit?

    • Kilowatt-hour (kWh)
    • Newton (N), which is the unit of force used when lifting a load
    • Watt (W), which is the unit of power rather than of energy
    • Joule (J), which is a unit of energy but is far too small for bills

  2. Electricity costs 30p per kWh. A fridge uses 5 kWh in a day. What is the daily cost?

    • £15
    • 50p
    • 15p
    • £1.50

  3. A 2 kW heater runs for 4 hours at 25p per kWh. What does it cost?

    • £20.00
    • £2.00
    • £8.00
    • £0.50

  4. A gas meter records 500 kWh at 6p per kWh. What is the cost?

    • £3
    • £0.30
    • £300
    • £30

  5. Which action most reduces the cost of heating a house?

    • Leaving doors open for air flow
    • Using more high-power appliances
    • Improving insulation so less energy is lost
    • Raising the thermostat in every room

  6. Which appliance would cost least per hour to run?

    • A 1200 W heater
    • An 800 W microwave
    • A 10 W LED bulb
    • A 2000 W kettle

  7. What is a standing charge on an energy bill?

    • A fixed charge that applies whatever energy is used
    • A fee for installing a new meter in the home, paid once at the start
    • A tax on energy stored in batteries and other storage products
    • A charge for each kWh used, which rises the more energy you use

  8. What does one unit recorded on an electricity meter represent?

    • One joule of energy, which is a much smaller amount than a unit on a meter
    • One newton of force, which is the push or pull acting on the meter
    • One watt of power, which is the rate at which energy is transferred
    • One kilowatt-hour of energy

  9. A 100 W TV runs for 5 hours at 30p per kWh. What does it cost?

    • £1.50
    • 5p
    • 15p
    • 30p

  10. A household uses 2 kWh per day at 20p per kWh. What is the cost over 30 days?

    • £2.40
    • £1.20
    • £12
    • £120

  11. Why do energy companies charge for energy in kWh rather than joules?

    • Joules are not a valid unit of energy, so the companies must use kWh
    • kWh measures power directly, so it is the best unit for showing a bill
    • A kWh is a practical size for household energy use
    • Joules are only used in power stations, not in homes or on bills

  12. Two heaters are used. Heater A is 1 kW for 5 hours and heater B is 2 kW for 2 hours. Which costs more to run?

    • You cannot compare them
    • Heater A, using 5 kWh
    • Heater B, using 2 kWh
    • They cost the same

  13. A dishwasher uses 1.2 kWh per cycle. What is the cost per cycle at 25p per kWh?

    • £1.20
    • 30p
    • 3p
    • 12p

  14. Why does the cost of using an appliance depend on how long it is on?

    • Energy used equals power divided by time
    • Cost depends only on the appliance's mass
    • Cost depends only on the wall socket
    • Energy used equals power multiplied by time

  15. A bill shows 300 kWh used over 90 days at 25p per kWh, plus a standing charge of £10 for the same period. What is the total?

    • £75
    • £95
    • £85
    • £300

  16. A household uses an average of 12 kWh per day. How many kWh does it use in a week?

    • 84 kWh
    • 12 kWh
    • 70 kWh
    • 96 kWh

  17. If the price per kWh doubles but energy use stays the same, what happens to the cost?

    • It quadruples
    • It halves
    • It stays the same
    • It doubles

  18. Which saves more energy: switching off a 2 kW fire for 10 minutes a day, or switching off a 60 W bulb for 2 hours a day?

    • Neither changes the energy used
    • Switching off the 2 kW fire for 10 minutes a day
    • Both save exactly the same energy
    • Switching off the 60 W bulb for 2 hours a day

  19. A home uses 9000 kWh a year at 28p per kWh, plus a standing charge of £100 a year. What is the annual bill?

    • £2520
    • £2100
    • £9000
    • £2620

  20. A 4 kW shower runs for 15 minutes. How much energy does it use?

    • 0.25 kWh
    • 1 kWh
    • 15 kWh
    • 4 kWh

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