Bare Eureka (Constantan) Wire – 22 SWG, 0.71mm, 125g Reel

This high‑quality Bare Eureka (Constantan) Wire is supplied on a 125g reel and manufactured to 22 SWG (0.71mm diameter). Made from a reliable copper‑nickel alloy, this wire features a low temperature coefficient of resistance, making it ideal for producing resistance coils and for use in physics and electronics experiments.

Its stable resistive properties ensure consistent performance under varying temperature conditions, making it an essential material for accurate and repeatable practical investigations in school laboratories.

Key Features

• 22 SWG wire with a 0.71mm diameter
• 125g reel for easy dispensing and storage
• Made from Eureka/Constantan copper‑nickel alloy
• Low temperature coefficient for stable resistance
• Ideal for resistance coils and electrical experiments
• Durable, flexible wire suitable for repeated classroom use

Ideal for School Science Lessons

Perfect for KS3, GCSE, and A‑Level physics, this Eureka wire supports a wide range of electrical investigations. Its predictable resistance characteristics make it ideal for experiments that involve measuring, comparing, or calculating electrical resistance.

• Constructing resistance coils and circuit components
• Investigating the relationship between length and resistance
• Exploring how different materials behave in electrical circuits
• Supporting Ohm’s Law and current‑voltage experiments
• Providing accurate, repeatable results for assessed practical tasks

Reliable, stable, and classroom‑ready, this 22 SWG Eureka wire is an essential resource for developing students’ understanding of electrical resistance and circuit behaviour.