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Constantan Wire
Constantan Wire (Product Code: SCL-476/133) is a copper–nickel resistance wire used to set up known, stable resistances in school and college electricity practicals. Physics departments choose it for meter bridge, potentiometer and resistivity work because its alloy of 55% copper and 45% nickel keeps its resistivity almost unchanged across a wide range of temperatures. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, in 100 g units.
Specifications
| Parameter | Detail |
|---|---|
| Quantity | 100 g of wire |
| Alloy composition | 55% copper, 45% nickel |
| Key property | Resistivity stays nearly constant over a wide range of temperatures |
| Typical applications | Science and electronics work, including laboratory resistance experiments |
| Product code | SCL-476/133 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Constantan Wire Used For?
In the physics lab, lengths of constantan wire are stretched along a meter bridge or potentiometer, or cut to form the unknown resistance in the specific-resistance experiment. Students measure the length with a metre scale and the diameter with a screw gauge, find the resistance, and then calculate resistivity. Because the resistivity barely changes as the wire warms under current, readings stay consistent through a practical session.
Constantan is also paired with copper to make simple thermocouple junctions for heat and thermoelectricity demonstrations. Cut pieces with a proper wire cutter, clean the ends with fine sand paper before clamping them in terminals, and avoid kinks, which change the local cross-section and spoil resistance readings.
Supplier
Jain Scientific Equipments Private Limited, known to schools and colleges by its trading name ScienceLab, sources Constantan Wire as part of its work as a physics instruments supplier in India. Wire orders can be combined with meters, bridges and other electricity apparatus in one consignment for institutions, dealers and importers in India and international markets. See our company profile for background on the company.
Related Laboratory Equipment
Constantan wire is normally used with these items in resistance and resistivity practicals:
- Meter Bridge — holds a stretched resistance wire for comparing unknown resistances
- Potentiometer, 10 wire — long-wire instrument for comparing emfs and finding internal resistance
- Screw Gauge — measures the wire diameter needed for the resistivity calculation
- Resistance Box — provides known resistances to balance against the wire
- Wire Cutter — cuts clean lengths for each student group
Browse the complete Physics Lab range for other electricity practical items.
Frequently Asked Questions
What is Constantan Wire made of?
Constantan Wire SCL-476/133 is an alloy of 55% copper and 45% nickel. This composition gives it a resistivity that stays nearly constant over a wide temperature range, which is why it is a standard choice for laboratory resistance experiments.
How much Constantan Wire comes in one unit?
Constantan Wire is listed in a quantity of 100 g per unit. The length contained in 100 g depends on the wire diameter, so tell us how many metres your class needs and we will advise on the number of units to order.
What diameter or gauge is this Constantan Wire?
The diameter of this Constantan Wire is not listed on this page. Tell us the gauge your meter bridge, potentiometer or resistivity experiment calls for through the contact page, and we will confirm what can be supplied before quoting.
Why use Constantan Wire instead of copper wire for resistance experiments?
Constantan Wire is preferred because its resistivity hardly changes with temperature and is far higher than that of copper, so a short length gives a measurable resistance that stays steady while current flows. Copper wire is better kept for low-resistance connections between components.
Who supplies Constantan Wire SCL-476/133?
Constantan Wire SCL-476/133 is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab) of Ambala, Haryana, India, which sources it for schools, colleges and dealers along with its range of physics lab electricity apparatus.
Can Constantan Wire be ordered in bulk for several labs?
Yes, Constantan Wire can be quoted in multiple 100 g units for several laboratories, institutional tenders or dealers in India and international markets. Send the quantity, preferred gauge and delivery location through the contact page or the enquiry cart.
Request a Quote
Send your Constantan Wire requirement, with quantity and preferred gauge, through our contact page, or place it in the enquiry cart together with the meter bridge, resistance box and other items for your electricity practicals.
Last updated: 24 September 2026
