What material is typically used for electric heating coils?

Electric heating coils are typically made from nickel chromium, commonly referred to as Nichrome. This alloy, which consists of nickel and chromium, is chosen for its excellent resistance to oxidation and its ability to withstand high temperatures without degrading. Nichrome can operate at elevated temperatures while maintaining its structural integrity, making it highly suitable for environments where heat is generated.

The other materials, while useful in various electrical applications, don't possess the same combination of thermal and electrical resistivity or longevity at high temperatures needed for electric heating coils. Copper, though a highly conductive material, can oxidize and does not withstand high temperatures as effectively. Aluminum also has conductivity benefits but similarly struggles with oxidation and high heat applications in comparison to Nichrome. Silicon carbide is primarily used in semiconductor applications or as a refractory material and does not provide the same performance characteristics as Nichrome in heating coils.