1
Q
Why is the core made of iron?
A
It can magnetise quickly
1
Q
A transformer is…
A
Two coils connected by an iron core
The coil carries current
The core carries magnetic field
2
Q
What are the four points for a transformer?
A
Current flows in the primary coil
This creates a magnetic field
AC (alternating current) cause the magnetic field to reverse
Secondary induces current in the secondary coil
3
Q
Why does the wire have to be insulated?
A
So that the current doesn’t go through the core
4
Q
Why are small transformers (switch transformers) used?
A
They are more efficient
They work at a higher frequency
5
Q
Why doesn’t DC work?
A
There is no changing current
X Unit 3 Physics
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