A DC motor is wired as shown in the figure. If the ammeter (DC) reads 30 A, determine and report the speed of the motor in RPM. Remember to use linear interpolation on the "curve". The machine has compensation windings. (It does not have an "S" coil).

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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.