Physics question need help (1 Viewer)

[lazyandcool]

explain how a transformer must have input of AC and not DC while utillising principle of electromagnetic induction?

 

[ohexploitable]

Faraday's Law states:

The induced electromotive force (EMF) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit.

A DC input will generate a constant magnetic field, no EMF will be induced as there is no change in magnetic flux. An AC input changes direction frequently, this results in a magnetic flux that changes direction frequently, since there is a change in magnetic flux, an EMF is induced.