# Electromagnetism: Electromagnetic Induction

### Description

This note provides you with an overview of electromagnetic induction, faraday's law and lenz's law. It also outlines the process undergone in an electrical generator. It is best used in conjunction with the mind map on electromagnetism.
Note by alex.examtime9373, updated more than 1 year ago
 Created by alex.examtime9373 over 10 years ago
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## Resource summary

### Page 1

Electromagnetic InductionWhere an emf is induced by a change in the magnetic flux linking a circuit

Faraday's Law The magnitude of the induced emf is proportional to the rate of change of magnetic flux E = dΦ/dt E = emf Φ = magnetic flux t = time

Lenz's Law The direction of the induced emf always opposes the charge causing it By combining Lenz's law with Faraday's law we get  E = - dΦ/dt

Generators Generators convert mechanical energy into electrical energy by rotating a coil of wire within a magnetic field.  This causes a constant change in the flux linking the coil, which induces an emf Most generators set up alternating current, which is current whose direction reverses constantly This is in contrast to direct current, which flows continuously in the same direction

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