Electronic Devices

In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280. If current in primary coil is 4 A, then that in the secondary coil is

  1. 10 A
  2. 6 A
  3. 4 A
  4. 2 A

Answer

Use formula,

Ip/Is = Ns/Np

4/Is = 280/140

Is = 4/2 = 2

The correct option is D.