WJEC GCSE Physics (Wales) · WJEC 3420U
1.9 Electromagnetism
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Electromagnetism
- Explain how a microphone converts sound into a varying electrical current. (4 marks, Explain)
- Explain how a transformer is used in the National Grid to reduce energy loss when electric… (4 marks, Explain)
- Explain how the generator effect is used in an alternator to produce an alternating curren… (4 marks, Explain)
- Explain how a loudspeaker uses variations in current to produce sound waves. (4 marks, Explain)
- Explain how an electric motor produces rotation. (4 marks, Explain)
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