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6. Potential difference = current x charge

  • False
  • True

7. What do we mean by resistance?

  • Opposition to current flow
  • Flow of charge

8. What effect does reversing a potential difference across a filament lamp have?

  • Nothing happens
  • The resistance increases
  • The resistance decreases
  • The current increases

9. The resistance of a filament lamp decreases as the current increases

  • False
  • True

10. What is the equation for current?

  • resistance of supply x number of lamps
  • p.d. of supply / total resistance
  • p.d. of supply x total resistance

11. What component's resistance decreases as the temperature increases?

  • A fuse
  • A thermistor
  • A Light Dependent Resistor
  • A diode

12. When components are joined in parallel, the potential difference across each component is the same.

  • True
  • False

13. An ammeter is placed in parallel.

  • False
  • True

14. What is the frequency of the UK mains supply?

  • 80
  • 4000
  • 30
  • 50
  • 230

15. Direct current flows in one direction only.

  • True
  • False

16. What is the voltage of the mains supply?

  • 50
  • 80
  • 230
  • 30
  • 4000

17. What colour is the live wire?

  • Purple
  • Yellow/green
  • Brown
  • Red
  • Blue

18. What wire is coloured blue?

  • Earth wire
  • Neutral wire
  • Live wire

19. Why are the pins of the plug made with brass?

  • Brass is ductile
  • Brass is a good conductor, hard and does not corrode
  • Brass is soft and easily corrodes

20. A fuse's rating should be

  • slightly higher than the normal working current of the appliance
  • slightly lower than the normal working current of the appliance
  • the same as the normal working current of the appliance of
  • much higher than the normal working current of the appliance
  • much lower than the normal working current of the appliance