3(e)
(i) How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of coil in them?
(ii) On which type of current do transformers work?
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(i) Relation between e.m.f. across primary and secondary coils of a transformer is given below:
$\frac{\text{emf across primary coil}}{\text{emf across secondary coil}} = \frac{\text{no. of turns in primary coil}}{\text{no. of turns in secondary coil}}$
(ii) Transformers work only with alternating current.