Question

How the voltage increases or decreases with current in a transformer?

Answer 1

As voltage is increased, the current decreases accordingly.

Similarity, as voltage is decreased, the current accordingly increases.

This happens to conserve electrical power and hence energy.

The electric power is given by,

`P = VI`

Now, there is no power source which can increase the power and hence power must be conserved (not considering the dissipative losses for now).

Thus, as `V` goes down `I` does up and vice versa.