As an example, consider two parts of equal-heated mass, one made from iron and one from copper. Copper is one of the most difficult materials to heat with induction in terms of efficiency, while iron is one of the easiest. Induction heating efficiency when heating copper is typically 15%, while iron is greater than 90%. To achieve the same temperature in the same time for the two parts, five times as much power would be required for the copper part. The difference in electrical resistivity and magnetic permeability are the main reasons for the differences in power requirements. The lower resistivity of copper requires significantly more current to generate the same I-squared-R losses as iron. Iron also benefits from the greater magnetic permeability, allowing it to be heated by hysteresis in addition to I-squared-R heating.
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