3(iii)
A transformer is used to change a high alternating e.m.f. to a low alternating e.m.f. of the same frequency.
(a) Identify the type of transformer used for the above purpose.
(b) State whether the turns ratio of the above transformer is = 1 or > 1 or < 1.
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(a) Step down transformer since it is used to change a high alternating voltage to a low alternating voltage.
(b) Turns ratio is n < 1, i.e., number of turns in the secondary are less than the number of turns in the primary.