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What happens to the Output of a Generator
when it Rotates Faster?

The alternating current from a generator
is shown below on a CRO (cathode ray oscilloscope).

Alternating Current from a Slow Generator

If the generator is turned faster, both the frequency
and the amplitude of the wave increase as shown below.

Alternating Current from a Fast Generator

The frequency increases (there are more waves in the
same time) because the generator completes
more rotations in the same time. One complete turn
of the generator produces one complete wave.

The amplitude increases (the waves go further up and down
from the zero line) showing that a
higher voltage is induced in the coil around the armature.
This happens because the coil is moving
through the field from the permanent magnet more quickly.

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