Transformers
Two coils on an iron core: how a transformer works, step-up and step-down, the turns ratio Vp/Vs = np/ns and power in = power out for an ideal transformer.
You will be able to
- Explain how a transformer changes an alternating p.d.
- Use Vp ÷ Vs = np ÷ ns to find a p.d. or a number of turns
- Use Vp Ip = Vs Is to find a current in an ideal transformer
25 minutes, 8 exam-style questions, with the Scientific Calculator.