This relationship can be shown by the following equation:
This can also be written as:
Step-up transformers have more turns on the secondary coil than they do on the primary coil.
Step-down transformers have fewer turns on the secondary coil than they do on the primary coil.
A transformer has 20 turns on the primary coil and 400 on the secondary coil. What is the output voltage if the input voltage is 500V?