Definition
A length of wire made from a special alloy chosen for its high electrical resistance, used in aircraft systems to drop voltage, limit current, generate heat, or measure temperature. Common alloys include nichrome (for heating elements) and materials like nickel or platinum (whose resistance changes predictably with temperature, making them useful in sensors).
Plain English
A wire designed to resist the flow of electricity rather than carry it freely. That resistance is what makes it useful — it can produce heat, reduce voltage, or change with temperature in a way that can be measured.
Context Anchor
Seen in aircraft electrical system discussions, especially around heating elements, light dimmers, and circuits that need a controlled reduction in electrical flow.
Derivation
From Latin resistere, 'to stand against.' A resistance wire literally 'stands against' the flow of electricity, converting some of that electrical energy into heat or producing a measurable change the system can use.
Why Pilots Care
Resistance wire is behind several systems pilots rely on every flight — pitot heat keeping the airspeed indicator working in icing, temperature gauges showing engine and outside air conditions, and various heating elements. When one of these systems fails, the cause is often a broken resistance wire or its connection.
Analogy
Resistance wire is like a narrow section in a water hose: it does not stop the flow completely, but it makes the flow harder and changes how the system behaves.
Intuition Check
Resistance does not mean the wire resists being bent or broken. Here it means the wire resists the flow of electricity.
Example Sentence 1
The pitot heat element is a coil of resistance wire that warms up when current flows through it, melting ice off the probe.
Example Sentence 2
Replacement of the resistance wire in the temperature probe restored accurate cockpit indications.