Use of Transformers
- The type of current produced in power stations is alternating current (AC) which is transferred to homes via the National Grid
- Transformers are used to increase and decreases the potential difference of the current before and after transmission across the National Grid
- They are made up of two coils of wire, called the primary and secondary coils, around a magnetic iron core
- A step-up transformer has more turns on the secondary coil than the primary
- A step-down transformer has more turns on the primary coil than the secondary
A step-up transformer
- Step-up transformers are used to increase the potential difference from the power station to the transmission cables
- Step-down transformers are used to decrease the potential difference, to a much lower value, from transmission cables for domestic use (houses, offices, shops)
