D.c. dynamo compared with an electric motor

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D.c. dynamo compared with an electric motor

Comparison of the d.c. dynamo described above with the electric motor on page 437 will show that the two machines are identical in construction. If a simple d.c. dynamo is connected to a battery it will run as a motor. Conversely, if a simple electric motor is made to rotate it will behave as a dynamo and deliver current at the brushes.When, therefore, an electric motor is running it acts as a dynamo and so produces an e.m.f. in opposition to that applied to it. This, is called a back e.mf, (See also page 439.)

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D.c. dynamo compared with an electric motor