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(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?

Electro-Magnetism

ICSE 2018

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Answer

(i) Relation between e.m.f. across primary and secondary coils of a transformer is given below:

emf across primary coilemf across secondary coil=no. of turns in primary coilno. of turns in secondary coil\dfrac{\text{emf across primary coil}}{\text{emf across secondary coil}} = \dfrac{\text{no. of turns in primary coil}}{\text{no. of turns in secondary coil}}

(ii) Transformers work only with alternating current.

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