# A wind turbine generates electricity by rotating a coil of wire inside a magnetic field. State two ways the induced voltage could be increased by changing the coil, and for each change, explain why the voltage increases.

> Pearson Edexcel International GCSE Physics (4PH1) — 6.3 Electromagnetic induction · Explain · 4 marks

> Wind turbines use the generator effect to produce electricity for homes. Engineers can alter the design of the coil inside the turbine to change the output voltage.

## Mark scheme (4 marks)

1. Increasing the number of turns on the coil (increases the induced voltage)
2. More turns means a greater length of wire is cutting through / experiencing the magnetic field, so a greater voltage is induced
3. Using a larger area coil (increases the induced voltage)
4. A larger area coil has a greater length of wire inside the magnetic field, so a greater voltage is induced

## Key terms

- [induced voltage](https://www.gradenine.co.uk/glossary/induced-voltage)
- [magnetic field](https://www.gradenine.co.uk/glossary/magnetic-field)
- [coil](https://www.gradenine.co.uk/glossary/coil)

## Related

- [Revision notes for Pearson Edexcel International GCSE Physics (4PH1)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-wind-turbine-generates-electricity-by-fbb94766) · Published by Druglandscape Ltd.