Resistance Law Experiment Device

The product is composed of a bottom plate, three different kinds of metal wire (copper wire, iron wire,nickel chrome wire), terminal, connecting piece etc.

Technical parameters of metal wire: a copper wire, diameter:φ0.3mm±0.04mm, effective length:400mm±2mm?0.12Ω?a iron wire, diameter:φ0.3mm±0.04mm, effective length:400mm±2mm?0.334Ω;two nickel chrome wire, diameter:φ0.3mm±0.04mm, effective length:400mm±2mm?6.3Ω?
Base:460×150×16mm