The use of MCB is more convenient than a fuse because :

1. it avoids the inconvenience of connecting a new fuse wire
2. it is much safer for quick response
3. it takes a very long time for tripping
4. both (1) and (2)

Complete the following sentences —

(a) A fuse is a short piece of wire of high ………. and of material low ………..

(b) A fuse wire is made of an alloy of ………. and ……….. If the current in a circuit exceeds the current rating of the fuse wire it ………..

(c) A fuse is connected in ………. with the ………. wire.

(d) Higher the current rating, ………. is the fuse wire.

(e) Live wire is also called ………. wire.

Two fuse wires are rated 5 A and 20 A. Which of the two is (i) thicker, (ii) longer?

(a) 'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V?

(b) Name two safety devices which are connected to the live wire of a household electric circuit.