A vacuum cleaner draws a current of 2 A from the mains supply.
(a) What is the appropriate value of the fuse to be fitted in its circuits?
(b) What will happen if a 13 A fuse is fitted in its circuit?

(a) The appropriate value of the fuse to be fitted in the circuit should be 3A because the capacity of fuse used by an appliance should be slightly larger than the value of normal current drawn through it.

(b) If a fuse of 13A is fitted in the circuit of the vacuum cleaner, then it'll allow very high current to flow through it, which will damage the vacuum cleaner during short-circuits and overloading.