Definition
A component in a turbine engine ignition system that takes low-voltage electrical input and stores it, then releases it as high-energy pulses to the igniter plugs in the combustion chamber. The exciter is the power-generating unit of a capacitor-discharge ignition system.
Plain English
The box that builds up electrical energy and then dumps it in strong bursts to make the spark that lights the fuel in a jet engine.
Context Anchor
Seen in aircraft electrical-system descriptions, generator or alternator maintenance, and troubleshooting for a unit that is not producing electrical power.
Derivation
From the verb 'excite,' meaning to stir up or energize. In electrical terminology, to 'excite' a circuit means to supply it with energy. The exciter is the part that does the energizing — it builds the charge that produces the spark.
Why Pilots Care
Without a working exciter the aircraft electrical system may fail to produce power, affecting instruments, radios, and charging.
Analogy
Think of it like the flash unit on an old camera — it slowly charges up from a small battery, then releases all that stored energy in one bright pulse on demand.
Intuition Check
Do not read “exciter” as something related to emotion or excitement. In this aviation electrical context, it means a device or circuit that energizes another electrical unit so it can work.
Example Sentence 1
After the start sequence began, a faint clicking from the exciter confirmed the ignition system was firing.
Example Sentence 2
During preflight the pilot noted the generator warning light stayed on until the exciter circuit energized.