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Power stations

Power stations produce alternating currents
We can `see' alternating currents using an oscilloscope

The dynamo produces a changing voltage and current

Page 2

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An oscilloscope shows how the alternating voltage changes
with time
The maximum voltage and the frequency can be found
from the trace

To calculate the frequency
the following equation is
Frequency = 1
The unit is hertz, Hz (waves per second)

Calculate the frequency when a wavelength or…

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The needle on the ammeter moves as the magnet is moved
in and out the coil
Electricity is only generated when the magnet is moving

Mini generators

A bicycle dynamo is small and
electrical generator
A magnet rotates inside a coil of wire
and an alternating current is produced

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There are three ways to increase the current from a dynamo
Use a stronger magnet
Increase the number of turns of wire on the coil
Rotate the magnet faster ­ on a bicycle the means
pedalling faster

The electricity generated in a power station it is transported all
round the…

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