Definition
A voltage produced in a conductor when it is exposed to a changing magnetic field. The change in magnetic flux through or around the conductor generates an electromotive force (EMF) that drives current if a circuit is complete. This is the principle behind generators, alternators, transformers, and ignition coils.
Plain English
Electricity created in a wire when a magnetic field around it is changing. Move a magnet past a wire, or change the magnetism near it, and a voltage appears in the wire.
Context Anchor
Seen in aircraft electrical system, alternator, generator, magneto, and ignition system discussions.
Derivation
From Latin inducere, meaning 'to lead in' or 'bring on.' The voltage is not connected directly to a source — it is 'led into' the conductor by a changing magnetic field nearby.
Why Pilots Care
Aircraft alternators rely on induced voltage to produce electrical power; understanding it helps diagnose charging problems that can affect flight instruments and radios.
Analogy
Like waving a magnet past a coil of wire to make a small current flow, similar to a bicycle dynamo light.
Grounding Statement
If a magnetic field near a wire is changing, a voltage appears in the wire — no battery or direct connection needed.
Intuition Check
Induced voltage is not voltage that was already sitting in the wire and simply moved along. It is voltage created by changing magnetism acting on a conductor.
Example Sentence 1
The alternator produces induced voltage as its rotor's magnetic field sweeps past the stator windings.
Example Sentence 2
During preflight, the mechanic verified there was no unwanted induced voltage in the shielded ignition leads.