Domestic Electricity

• Label them.

  A) Earth wire

  B) Neutral wire

  C) Cable Grip

  D) Fuse

  E) Live wire

  F) Outer insulation

  
• • copper wires are good conductors
• • plastic is a good insulator
• Whats the role of the cable grip?

  This holds the cable tightly in place so that wires do not become loose
• Whats the function of the live wire?

  Copper wire coated with brown plastic along which the current enters the device
• what is the function of the Fuse?

  A glass or ceramic canister containing a thin wire that melts if the current gets too high
• What is the function of Neutral wire?

  Copper wire coated with blue plastic that also connects to the cable in the wall and completes the circuit
• Function of earth wire?

  Copper wire coated in striped plastic that provides a path for current to flow from the case of the device to the ground if there is a fault
• The energy transferred by an appliance can be calculated using the equation: energy transferred = Power x Time
• • energy (E) is measured in joules (J)
• • power (P) is measured in watts (W)
• • time (t) is measured in seconds (s)
• Power can also be calculated using the equation: Power = Current x Resistance
• • Power (P) is measured in watts (W)
• • potential difference (V) is measured in volts (V)
• • current (I) is measured in amps (A)
• What colour is neutral and where is it located?

  Blue, bottom left
• What colour is the earth wire and where is it located?

  Green and yellow stripe. Located in a three-pin plug or electrical wiring.
• What colour is the live wire and where is it located?

  Brown, inside the insulation of a cable.
• What three wires are found in cables connecting to the mains? Live, neutral, earth