If a current in a magnetic field produces motion, can motion in a magnetic field produce current? YES! This is electromagnetic induction — discovered by Faraday in 1831. Move a magnet into a coil, and current flows. Stop moving, and the current stops. This simple principle generates virtually ALL the world's electricity — from nuclear power stations to wind turbines to the dynamo on your bike!
KEY REQUIREMENT: The magnetic field must be CHANGING. A stationary magnet in a coil induces no voltage!
This introduction covers The Motor Effect in Reverse 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 1 of 9 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
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
How to induce voltage?
Change magnetic field through conductor
AC generator output type?
Alternating current (sinusoidal)