Transforming Voltage and Current (Also seen at GCSE Physics 3)
There are two types of transformers:
Step Up
The voltage in the secondary coil is larger than the voltage in the primary coil.
The current in the secondary coil is smaller than the current in the primary coil.
There will be more turns of wire on the secondary coil meaning more flux linkage
Step Down
The voltage in the secondary coil is smaller than the voltage in the primary coil.
The current in the secondary coil is larger that the current in the primary coil.
There will be fewer turns of wire on the secondary coil meaning less flux linkage
In both cases the voltage and current (VP and IP) in the primary coil of NP turns is linked to the voltage and current (VS and IS) in the secondary coil of NS turns by the following equation: