Pages in this set

Page 1

Preview of page 1
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

Preview of page 2
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
used:
Frequency = 1
period
The unit is hertz, Hz (waves per second)

Calculate the frequency when a wavelength or…

Page 3

Preview of page 3
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

Page 4

Preview of page 4
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…

Page 5

Preview of page 5

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »