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6. Each unit costs 14p. For how long can a 6kW heater be used for?

  • 2 hours
  • 1 hours
  • 10 minutes
  • 7 minutes

7. Power is usually measure in what?

  • Watts (w) or Kilowatts (kW)
  • Energy
  • Just watts (w)
  • Just joules (j)

8. A KILOWATT-HOUR is the amount of electrical energy is used by a 1kW appliance left on for 1 Hour.

  • Depends
  • True
  • False

9. Which is true?

  • A 50kW appliance transfers 5000 J in 1 second p
  • A 5kW appliance transfers 5000 J in 1 second
  • A 5kW appliance transfers 500 J in 1 second
  • kW = J x 10

10. Energy is usually measured in what?

  • Power
  • Joules (j)
  • Watts (w)