Question

Joules law of heating is applicable to electric motors

Answer 1

:Electric heater or stove,electric Radiators and electric Iron.All these are based on the same principle that is produced when electric current flows through a wire.These contain coils of nichrome (an alloy of nickle and chromium) and large currents of the order of 3 to 5 amperes can be passed through them.In the case of an electric heater working 220 volts and consuming a power of 1000 watts,the current through the coils will be 4.55 amperes.The resistance of the coil will be 48.4 ohms.In the case of electric radiators ,the coil is placed along the axis of a parabolic metallic reflector or at the focus of a concave reflector.