A transformer is to be used to step down voltage from an alternating current source from 220 V to 110 V. If the primary has 120 turns, then the number of turns in the secondary is
A) 2.
B) 60.
C) 240.
D) 720.
E) 1320.

Question

Quizplus · Accepted Answer

The ratio of the number of turns in the primary to the number of turns in the secondary is equal to the ratio of the voltages. In this case:

220 V / 110 V = 120 turns / x

Solving for x:

x = (120 turns * 110 V) / 220 V = 60 turns

Therefore, the answer is B) 60.

A Transformer Is to Be Used to Step Down Voltage