Constantan Wire Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12473
Jlab Export is a leading Constantan Wire Manufacturer,and suppliers in India
Constantan Wire (code EL-PL-12473) is a copper-nickel resistance wire, 55% copper and 45% nickel, whose resistivity stays nearly constant across a wide range of temperatures. That makes it the usual wire for metre bridges, potentiometers, home-wound resistance coils and resistivity practicals, where a reading must not drift as current warms the wire. JLab makes it in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL476/133 |
| Quantity | 100 g |
| Alloy | 55% copper, 45% nickel |
| Key property | Resistivity nearly constant over a wide temperature range |
| Quality check | Each wire pack is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-12473 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Finding Resistivity from a Measured Length
Cut about a metre, stretch it straight along a metre rule and connect a measured length l into the circuit. Find its resistance R with a metre bridge, or from voltmeter and ammeter readings using R = V/I. Measure the diameter d with a screw gauge at several points along the length, turning the wire between readings, and take the mean. Resistivity is then ρ = RA/l, where A = πd²/4.
Why Constantan Rather Than Steel
Run the same test with a steel wire and leave the current on: the steel’s resistance climbs as it warms, so successive readings drift. Constantan gives nearly the same R at the start and the end of the run, which is why bridge and potentiometer wires are often made from it. Keep the current small all the same, and switch off between readings.
Related Wires and Instruments
- Meter Bridge — 1 m bare constantan slide wire on aluminium, with jockey.
- Potentiometer, 10 wire — ten 1 m constantan wires on an aluminium extrusion, with jockey.
- Steel Wire — 100 g of steel wire to contrast with constantan’s steady resistance.
- Screw Gauge — screw gauge with ratchet top for measuring the wire’s diameter.
Bridges, potentiometers and other electricity apparatus are in Physics Lab.
Request a Quote
Order through Add To Cart, or send the quantity in 100 g lots and your delivery address via the contact page.
Last updated: 26 October 2026
