Transformers change the size of the pd of an alternating
current
They all have two coils of wire, the primary and the
secondary, joined with an iron core
Alternating current in primary coil causes continuously
changing magnetic fluc in the core
When an alternating pd is applied across the primary cooil,
the iron core magnetises and demagnetises quickly
The change in magnetic field induces and alternating pd in
the secondary coil
If the second coil is part of a complete circuit, this causes a
current to be induced
Ratio between the primary and secondary pd is the same as
the ratio between the number of turns on the primary and
secondary coils
Step up transformers -have more turns on the primary coil Transformers
that the secondary coil Topic
Step down transformers - they have more turns on the pimary
coil than the secondary
current
They all have two coils of wire, the primary and the
secondary, joined with an iron core
Alternating current in primary coil causes continuously
changing magnetic fluc in the core
When an alternating pd is applied across the primary cooil,
the iron core magnetises and demagnetises quickly
The change in magnetic field induces and alternating pd in
the secondary coil
If the second coil is part of a complete circuit, this causes a
current to be induced
Ratio between the primary and secondary pd is the same as
the ratio between the number of turns on the primary and
secondary coils
Step up transformers -have more turns on the primary coil Transformers
that the secondary coil Topic
Step down transformers - they have more turns on the pimary
coil than the secondary
