Bare Eureka (Constantan) Wire – 28 SWG, 0.38mm, 125g Reel

This high‑quality Bare Eureka (Constantan) Wire is supplied on a 125g reel and manufactured to 28 SWG (0.38mm diameter). Made from a stable copper‑nickel alloy, this wire offers a low temperature coefficient of resistance, making it ideal for building resistance coils and carrying out electrical investigations in school science laboratories.

Its predictable resistance behaviour allows students to obtain clear, consistent data during physics practicals, making it a valuable material for experiments exploring electrical resistance and circuit behaviour.

Key Features

• 28 SWG wire with a 0.38mm diameter
• Supplied on a 125g reel for convenience
• Made from Eureka/Constantan copper‑nickel alloy
• Low temperature coefficient ensures stable resistance values
• Ideal for resistance coils and electrical circuit construction
• Durable and flexible for repeated teaching use

Ideal for School Science Lessons

Perfect for KS3, GCSE, and A‑Level physics, this Eureka wire is suited to a wide range of electrical and resistance‑based investigations. Its stable behaviour under varying temperatures makes it especially useful for accurate practical work.

• Building resistance coils for measurement activities
• Exploring resistance vs length in circuit investigations
• Supporting Ohm’s Law and current–voltage experiments
• Demonstrating the effect of material properties on electrical resistance
• Providing consistent data for assessed physics practicals

Reliable, easy to handle, and ideal for classroom use, this 28 SWG Eureka wire is a must‑have resource for teaching electrical principles in school science laboratories.