Electricity in the Home

• True or False? Mains supply electricity is an alternative current?

  True
• What is potentially differnce and the frequency of the UK mains supply?

  50 Hz
• Name and give the colours of the three wires in a three-core cable. Why are they colour coded?

  • Earth wire - green + yellow
  • Neural wire - blue
  • Live wire - brown

  Colour codes for safety
• Explain why touching a live wire is dangerous:

  The current is high and can cause a shock.