3(ii)
(a) Which electrical component protects the electric circuit in case of excess current and which can also be used as a switch?
(b) Name the wire to which this electrical component is connected in an electric circuit.
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(a) Miniature circuit breaker [MCB] can be used to protect the electric circuit in case of excess current and can also be used as a switch.
(b) The MCB is always connected in series with the live wire in the household circuit.