Q14 of 24 Page 369

Two fuse wires of same length are rated 5 A and 20 A. Which of the two fuse wires is thicker and why?

The wire of 20 A is thicker than that of 5 A. We know that the resistance of a wire is inversely proportional to the area of cross-section of the wire. Thus, the wire having higher current through it should have lesser resistance.

More from this chapter

All 24 →
12

If instead of electron a neutron enters a field, what will be its direction of motion? Give reasons for your answer.

 13

What is the principle of an electric generator?

 15

a. On what principle does an electric fuse work?

b. What is the frequency of A.C. in India? State one advantage of A.C over D.C.

 16

Two coils 1 and 2 of insulated copper wire having large but different number of turns are wound over a cardboard cylinder. Coil 1 is connected to battery and a plug key. Coil 2 is connected to a galvanometer.
How will the galvanometer reading change when

(i) key is plugged in and


(ii) key is taken out? Give reason for your answer in each case.