separately excited DC motor delivers 10 HP at 1,000 rpm, while producing an induced armature voltage of 110 Volts. The motor's armature circuit is powered by a DC source V_{T} = 220V The field windings are powered from a separate DC source V_{F} = 100V and the total field resistance R_{F} = 160 ohms You may assume that the rotational losses of this motor are negligable. Calculate the motor's overall efficiency in percent.

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DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.