Constantan Wire (100gm)
Product Code : SCL-EAE-11251
Quick answer: Constantan Wire (100 g), also called Eureka wire, is a copper-nickel resistance wire whose resistance stays nearly constant as it warms. It is cut to length for metre bridge and potentiometer wires, resistivity determination, Ohm's law circuits and experimental resistance coils. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Wire type | Constantan (Eureka) resistance wire |
| Pack weight | 100 g (nominal) |
| Category | Electrical laboratory consumable |
Gauge, diameter, length per pack and resistance per metre are not listed on this page; email [email protected] with the gauge required.
Uses
Constantan, also sold as Eureka wire, is a copper-nickel alloy whose resistivity is many times that of copper and almost unaffected by temperature over the ordinary laboratory range. A constantan wire therefore gives a steady resistance per unit length, which is what a metre bridge or a potentiometer relies on.
- Confirm the gauge required by the experiment.
- Straighten a length of wire and check it for kinks or corrosion.
- Measure and cut the length needed, then fix it between terminals or along a scale.
- Measure the diameter with a screw gauge at several points and take the mean.
- Pass a small current, record V and I, and calculate resistance and resistivity.
In a metre bridge the balance length on the wire gives the ratio of two resistances; in a potentiometer the fall of potential per centimetre of wire lets students compare the EMFs of two cells or find internal resistance.
Key features
- Constantan (Eureka) wire with nearly constant resistance over lab temperatures
- Suits metre bridge and potentiometer wires, where steady resistance per length matters
- Used for resistivity determination and Ohm's law circuits
- Can be wound into experimental resistance coils
- 100 g nominal pack, cut to length as needed
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the constantan wire (100 g) at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Electrical and Electronics products
- Nichrome Wire (100gm) (SCL-EAE-11252)
- Manganin Wire (100gm) (SCL-EAE-11246)
- Electric Bell Demonstration (SCL-EAE-11257)
- Potentiometer Apparatus (SCL-EAE-11258)
- Step Down Transformer (SCL-EAE-11259)
- Resistance Coil (SCL-EAE-11260)
The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
Why is constantan used for metre bridge and potentiometer wires?
Its resistance per unit length hardly changes as the wire warms, so balance lengths stay reliable throughout the experiment.
Is constantan the same as Eureka wire?
Yes. Eureka is another name for constantan, a copper-nickel resistance alloy.
What is the price of the constantan wire (100 g)?
Prices are not published on the website. Add the constantan wire (100 g) to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11251 and the quantity, to receive a quotation.
Does Lab Exports manufacture the constantan wire (100 g)?
Yes. Lab Exports manufactures the constantan wire (100 g) at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11251.
Request a quote
Email [email protected] with the house code SCL-EAE-11251 and the quantity, or add the constantan wire (100 g) to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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