$(a)$ Which effect of the electric current is utilised in the working of an electrical fuse?
$(b)$ Is a fuse connected in series or in parallel in a household circuit?
$(c)$ Draw a schematic labelled diagram of a domestic circuit which has a provision of a main fuse,meter,one light bulb,and a switch socket.

(N/A) The heating effect of electric current is utilised in the working of an electrical fuse. When the current exceeds the safe limit,the wire melts due to excessive heat,breaking the circuit.
$(b)$ $A$ fuse is always connected in series with the live wire in a household circuit so that it can break the circuit if the current becomes too high.
$(c)$ The schematic diagram of a domestic circuit is provided below.