6.2.3 Domestic uses and safety Flashcards
Most electrical appliances are connected to the mains using three core cable. what are these cables?
live wire, neutral wire, earth wire
why is the insulation covering each wire colour coded?
for easy
identification
colour of live wire
brown
colour of neutral wire
blue
colour of earth wire
green and yellow stripes.
what does the live wire carry?
the alternating potential difference from the supply.
The neutral wire?
completes the circuit
what is the use of the earth wire ?
The earth wire is a
safety wire to stop the appliance from becoming live
The potential difference between the live wire and earth (0 V) is?
about 230 V
The neutral wire is at, or close to?
earth potential (0 V)
The earth wire is at ?
0 V, it only carries a current if there is a fault.
a live wire may be dangerous even when?
a switch in the mains circuit is open
if the live wire becomes loose and touches the metal case, the case can become live. What can happen if someone touches this?
they can experience a fatal electric shock
