Assertion (A): Same current flows through the live wires and the filament of a bulb, but the heat produced in the filament is much higher.

Reason (R): The filament of a bulb is made of low resistance and high melting point.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

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.