Definition
An alloy of copper, manganese, and nickel used to make precision electrical resistors. Manganin has very low temperature coefficient of resistance, meaning its resistance changes very little as temperature varies, which makes it valuable for measuring instruments and shunts where stable, predictable resistance is required.
Plain English
A special metal mix used to make resistors that keep almost the same electrical resistance even when they get warm or cool. This stability is what makes it useful inside accurate measuring instruments.
Context Anchor
Seen in aircraft electrical-system and instrument-maintenance discussions, especially around precision resistors, current-measuring circuits, and ammeters, which are gauges that show electrical current.
Derivation
The name comes from manganese, the main alloying element that gives the material its stable electrical properties. The '-in' ending follows the common pattern for naming metal alloys.
Why Pilots Care
Manganin is used for shunt resistors in aircraft ammeters and other precision electrical instruments so current readings stay accurate despite temperature changes in the cockpit or engine compartment.
Intuition Check
Do not read manganin as manganese. Manganin is a copper-based metal mixture named for its manganese content, valued because its resistance stays nearly constant with temperature.
Example Sentence 1
The ammeter shunt was made of manganin so that engine heat would not throw off the current reading.
Example Sentence 2
Because manganin holds its resistance value, the instrument calibration remained steady after the engine reached operating temperature.