Definition
An inductor placed in an electrical circuit to oppose changes in current. A choke coil readily passes direct current and low-frequency signals while blocking, or 'choking off,' higher-frequency alternating current. It is commonly used in aircraft electrical and avionics systems to filter out unwanted electrical noise and smooth pulsating DC.
Plain English
A coil of wire that lets steady electricity flow through but holds back fast electrical fluctuations. It cleans up the power going to sensitive equipment.
Context Anchor
Seen in aircraft electrical system discussions, especially around filters, radios, generators, alternators, and noise suppression.
Derivation
From 'choke,' meaning to restrict or block. The coil 'chokes' off high-frequency alternating current while letting steady current pass through, which is how it earned the name.
Why Pilots Care
It prevents radio noise and interference that could disrupt communication and navigation equipment during flight.
Analogy
Think of a choke coil like a speed bump for electricity: slow, steady traffic rolls over it without trouble, but anything moving fast and erratic gets held back.
Intuition Check
A choke coil is not the same as an engine choke used for fuel-air mixture. Here, “choke” means an electrical part that restricts rapid current changes.
Example Sentence 1
The avionics technician traced the radio static to a failed choke coil in the power supply.
Example Sentence 2
During the electrical inspection, the mechanic verified that the choke coil was preventing interference from the alternator.