What energy conversion does take place in a generator when it is in use?

State one advantage of using an a.c. over the d.c.

Complete the following sentences —

(i) In a step up transformer, the number of turns in the primary are ….. than the number of turns in the secondary.

(ii) The transformer is used in ………….. current circuits.

(iii) In a transformer, the frequency of a.c. voltage ……… (increase / decreases / remains same)

Name the material of the core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator, and (e) a transformer.