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The alternating current
from a generator
is shown below on a CRO (cathode ray oscilloscope).
If the generator is turned faster,
both the frequency and the
amplitude of the wave increase.
The frequency increases (there are more waves in the
same time)
because the generator turns
more times 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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