Quotation from: General Science

Written by: Bertha M. Clark


322. Powerful Dynamos. The power and efficiency of a dynamo are
increased by employing the devices previously mentioned in connection
with the motor. Electromagnets are used in place of simple magnets,
and the armature, instead of being a simple coil, may be made up of
many coils wound on soft iron. The speed with which the armature is
rotated influences the strength of the induced current, and hence the
armature is run at high speed.

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