Question

A step-down transformer produces a voltage of 5.4 V across the secondary coil when the voltage across the primary coil is 140 V.

What voltage appears across the primary coil of this transformer if 140 V is applied to the secondary coil?

Answer 1

Initial voltage in the primary coil = V₁ = 140 V

Initial voltage in the secondary coil = V₂ = 5.4 V

Turns ratio of the transformer = n

n = 25.93

New voltage in the primary coil of the transformer = V₃

New voltage in the secondary coil of the transformer = V₄ = 140 V

V₃ = 3630 V

Voltage across the primary coil of the transformer if 140 V is applied to the secondary coil = 3630 V