Bare Eureka (Constantan) Wire – 0.27 mm Diameter (32 SWG), 125 g Reel

This Bare Eureka (Constantan) Wire is supplied on a 125 g reel and manufactured to a 0.27 mm diameter, equivalent to 32 SWG (Standard Wire Gauge). Made from a copper–nickel alloy with a very low temperature coefficient of resistance, this wire is ideal for precise electrical experiments where resistance must remain stable despite temperature changes. It is widely used for resistance coils, bridge circuits, Ohm’s law investigations, and other controlled electrical measurements.

Lightweight, easy to shape, and consistent in performance, this fine‑gauge Constantan wire is perfectly suited to detailed school and college physics work.

Key Features

• 125 g reel of bare Eureka/Constantan wire
• 0.27 mm diameter (32 SWG)
• Copper–nickel alloy with a low temperature coefficient
• Provides stable, predictable resistance values
• Ideal for constructing fine resistance coils and precision components
• Easy to wind, form, and integrate into circuit setups
• Suitable for physics and electronics applications

Ideal for School Science Lessons

Perfect for KS3–KS5 physics, this fine‑gauge wire supports investigations such as:

• Constructing precision resistors and miniature resistance coils
• Exploring Ohm’s law with reliable, consistent readings
• Comparing resistance across different conductor materials and thicknesses
• Studying the effect of temperature on resistance
• Building bridge circuits, potentiometers, and sensitive measuring devices

A valuable and dependable resource for any school physics laboratory requiring stable, fine‑gauge resistance wire.