Question

A transformer has a square wave current applied on one of the primary side. The output side will output what for its current?

a) No output

b) Sine wave

c) Regular spikes

d) Square wave

Answer 1

Answer: C ) Regular spikes

As in a square wave, the value of current remains the same for half-cycle and then reverses after every half cycle. During the half-cycle as the current does not change its value there is no induced emf in the secondary coil.

Hence only during transitions of the half-cycle where the current changes we get output and this output will be in term of regular spikes.