Quotation from: General Science

Written by: Bertha M. Clark

In the _motor_, current produces motion. In the _dynamo_, motion
produces current.

321. The Dynamo. As has been said, the arrangement of the preceding
Section is a dynamo in miniature. Every dynamo, no matter how complex
its structure and appearance, consists of a coil of wire which can
rotate continuously between the poles of a strong magnet. The
mechanical devices to insure easy rotation are similar in all respects
to those previously described for the motor.