In a transformer, number of turns in the primary coil are 140 and that in the secondary coil are 280

• 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,

I_p/I_s = N_s/N_p

4/I_s = 280/140

I_s = 4/2 = 2

The correct option is D.