The voltage across the input terminals of a transformer is 120 V. The primary has 25 loops and the secondary has 50 loops. The voltage the transformer delivers is
A)30 V.
B)60 V.
C)120 V.
D)240 V.
E)none of the above

Question

Quizplus · Accepted Answer

The voltage delivered by a transformer is directly proportional to the number of turns in the secondary coil. In this case, the secondary has twice as many turns as the primary, so the voltage delivered by the transformer will be twice the input voltage.

V_secondary = V_primary * (N_secondary / N_primary)
V_secondary = 120 V * (50 / 25)
V_secondary = 240 V

The Voltage Across the Input Terminals of a Transformer Is