The live wire inside a room heater accidentally comes loose and touches its metallic casing, which is properly connected to the earth wire.
(a) Describe what happens to the current in the circuit immediately after this fault occurs.
(b) Name the safety device that operates as a result and state how it prevents electric shock to the user.
a. (a) Describe the change in current.
b. (b) Name the safety device and its protective action.