1
Q
Whats a fuse
A
its a short thin piece of wire which becomes hot that melts when current flowing thru it is greater than its rated value
2
Q
Why must switch be on live wire
A
switching off can disconnect high voltage from appliance
3
Q
What earth wire do
A
carry leakage current from casing of any appliance away to earth due to its low resistance
4
Q
What does double insulation do
A
If appliance got fault, a non conducting casing prevent user from getting shocked
Physics
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