🎯 Common Question Types:
- State the condition needed for electromagnetic induction (1-2 marks)
- Describe three ways to increase the induced voltage (3 marks)
- Explain the difference between an AC generator and a DC dynamo (3 marks)
- Explain why a moving magnet induces a current but a stationary magnet does not (2 marks)
- Use Lenz's law to explain the direction of an induced current (2-3 marks)
- Explain why the National Grid transmits electricity at high voltage (HT, 2-4 marks)
📝 Key Command Words:
- State: Give the condition (changing magnetic field) — one clear sentence
- Explain: Link the change in magnetic field to the force on electrons — give a mechanism
- Describe: Say what happens step by step (magnet moves in → field increases → voltage induced)
- Suggest: Apply the three factors to a new device you haven't seen before
⚠️ Common Mistakes to Avoid:
- Saying "the magnet must be moving" — it's the CHANGING magnetic field that matters (rotating coil also works)
- Confusing slip rings (AC, induction) with split-ring commutator (DC, motor)
- Forgetting that reversing motion OR reversing field BOTH reverse current direction
- Mixing up the motor effect (current in field → force) with induction (motion in field → voltage)
This exam tips covers Exam Tips for Electromagnetic Induction within Electromagnetic Induction for GCSE Physics. Revise Electromagnetic Induction in Magnetism for GCSE Physics with 18 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 8 of 9 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Electromagnetic Induction
What is electromagnetic induction?
Explain how a potential difference (voltage) is induced in a conductor in a magnetic field.
Quick recall flashcards
AC generator output type?
Alternating current (sinusoidal)
How to induce voltage?
Change magnetic field through conductor