4.a. The device which responds to the heat developed within the motor is the A. shading coil. B. short-circuiter. C. bimetallic protector. D. current-operated relay. 4.b. How is a rotating magnetic field produced during starting in a split-phase motor? A. A capacitor is inserted in the auxiliary-winding circuit. B. A low resistance coil is placed around a portion of each pole. C. Brushes are shifted off the hard-neutral position. D. An auxiliary winding is made with a high ratio of resistance to reactance.

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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.