Electromagnetic induction is the production of a voltage across a conductor when it is exposed to a varying magnetic field. This process is essential in which of these devices?
A) A diode.
B) A capacitor.
C) A transformer
D) A potentiometer.
Transformers rely on alternating current to induce a current in a secondary coil from a primary coil without them being connected - this voltage is stepped up or down depending on the ratio of turns in each of their coils.
