P4 supplying electricty Flashcards
what does a battery provide
direct current
DC
what does mains electricity provide
alternating current
AC
what colour is the earth wire
green and yellow
what does the earth wire do
safety
has a 0V
only carries voltage if there is a fault
what colour is the neutral wire
blue
what does the neutral wire do
completes circuit
what colour is the live wire
brown
what does the live wire do
carries voltage
how much potential difference does the live wire carry
230V
why is plastic used to coat wires and plug case
Because plastic is an electrical insulator
what is the fuse connected to
the live wire
what is the live wire connected to
the fuse
what does the fuse do
keeps appliance safe
if voltage goes over what is safe fuse will break
SHORT CIRCUIT
what is a short circuit
when the fuse breaks and disconnects live wire from the mains
what metal is used inside wires
copper
