Electromagnetism: Electromagnetic Induction

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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