Quick Answer: Constantan Resistance Coil Wire is a copper–nickel resistance-alloy wire supplied in coil form for winding resistance coils, rheostats and experimental resistors, and for low-voltage bridge experiments.
Last updated: October 2026
Key Features
Copper–nickel resistance alloy
Supplied as a coil for measuring, cutting and winding
Suitable grades show limited resistance change over their specified temperature range
Used for resistance coils, rheostat winding and meter bridge or Wheatstone bridge work
Technical Specifications
Specification
Value
Product type
Electrical resistance-alloy wire
Alloy family
Copper–nickel resistance alloy
Supply form
Coil
About This Product
To build a coil, the length needed for the target resistance is worked out, the wire is wound evenly on a heat-resistant insulating former so that bare turns do not touch, and it is tested briefly in a current-limited low-voltage circuit. Gauge decides the resistance per unit length and the safe current, so it should be specified when ordering this coil from the Magnetism range.
Frequently Asked Questions
Q1. Is Constantan Resistance Coil Wire the same as Eureka wire? Constantan and Eureka are names commonly used for related copper–nickel resistance alloys; the exact grade and composition depend on the wire supplied.
Q2. How does the wire's resistance depend on its size? Resistance depends on the alloy's resistivity, the wire length and its cross-sectional area. A longer or thinner wire gives a higher resistance.
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