Definition
A length of resistance wire that becomes hot when an electric current passes through it. In aircraft systems, hot wires are used as heating elements in devices such as pitot heat, stall warning vane heaters, propeller de-icing boots, windshield heat panels, and certain cutting or sealing tools used in maintenance.
Plain English
A wire that gets hot on purpose when electricity flows through it, used to warm something up or melt through material.
Context Anchor
Seen in aircraft electrical troubleshooting, wiring checks, switch repairs, and maintenance discussions about whether power is present in a circuit.
Derivation
The wire's resistance to electrical flow turns electrical energy into heat, so the wire literally becomes hot in operation. The name describes exactly what it does.
Why Pilots Care
Contact with an unrecognized hot wire during maintenance can create shorts, sparks, or electrical shock.
Intuition Check
Hot does not mean the wire is physically warm here. It means electrical power is present on the wire.
Example Sentence 1
Before flying into known icing, the pilot confirmed the pitot hot wire was working by feeling warmth at the probe during preflight.
Example Sentence 2
The wiring diagram labeled the line from the battery relay as the hot wire.