How do we find the direction of movement, magnetic field and current in a generator?
Use Fleming's RIGHT hand rule
4 of 14
Because the induced current switches direction every half turn in a GENERATOR, what type of current is produced?
Alternating current
5 of 14
If a transformer is a STEP-UP transformer, the primary coil will have ____ turns than the secondary coil
less
6 of 14
In a TRANSFORMER an alternating _______ is applied to the primary coil. This causes an alternating magnetic field to be set up in the core. Because the secondary coil is within the magnetic field it induces an alternating _______. What is the missing word
voltage
7 of 14
Why do the national grid use transformers to REDUCE THE CURRENT?
When a large current flows through a wire lots of energy is lost as heat
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How do transformers REDUCE THE CURRENT?
Increase the voltage
9 of 14
Electrical power =
Voltage * current
10 of 14
When a magnet is spun inside a coil in a DYNAMO a potential difference is produced between the two ends of the coil causing a _______ to flow
current
11 of 14
In a GENERATOR the slip rings are connected to
the coil
12 of 14
In a GENERATOR the brushes connect the spinning slip rings to
the external circuit
13 of 14
Is mains electricity AC or DC?
AC
14 of 14
Other cards in this set
Card 2
Front
Generators induce a current by
Back
Either
Card 3
Front
A bicycle dynamo is an example of
Back
Card 4
Front
How do we find the direction of movement, magnetic field and current in a generator?
Back
Card 5
Front
Because the induced current switches direction every half turn in a GENERATOR, what type of current is produced?
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