Why does an iron-cored choke exhibit a higher effective resistance than its actual resistance when operating at standard supply frequency?

Explanation

The effective resistance of an iron-cored choke exceeds its true resistance primarily due to energy losses in the iron core, known as iron losses. These losses arise from hysteresis and eddy currents within the core material when subjected to alternating magnetic fields. Skin effect and temperature increase have lesser impact, while capacitive effects are minimal at standard frequencies.