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Question

A transformer has 20 turns of wire in its primary coil and 40 turns on its secondary coil.

(a) Is this a step-up or step-down transformer?
step down
step up

(b) If an alternating voltage with an effective voltage of 120 V is applied to the primary, what is the effective voltage induced in the secondary?
______V

Answer 1

Ok :

a) That is a step up transformer.

b) You know the relationship : V1 / V2 = N1 / N2

N = turns

V = voltage

120 Volts / V2 = 20 / 40

V2 = 240 Volts

Answer 2

It is a step-up transformer. The voltage ratio is the same as the turns ratio, or 2:1. An input voltage of 120VAC will output 240VAC