The process by which energy is transferred between windings without a direct electrical connection is called what?

• A. Induction
• B. Conduction
• C. Radiation
• D. Capacitance

Answer: (A)

Transferring energy between windings without a direct connection uses electromagnetic induction. An alternating current in the primary winding creates a changing magnetic flux in the core, which links to the secondary winding and induces a voltage there. The energy moves through the magnetic field rather than through a conductor. Conduction would need a direct metal path, which isn’t present. Radiation would involve energy traveling as waves away from the device and is not how transformers are designed to operate. Capacitance involves energy in the electric field between conductors and isn’t the primary transfer method here. So induction is the correct mechanism.