BRAINCAKEThe Alternating Current Generator
An a.c. generator is a rectangular coil that spins in a uniform magnetic field. When the coil spins the flux linkage changes continuously. The flux linkage is given by NΦ = BANcosθ where θ is the angle between the normal to the plane of the coil and the magnetic field. If the coil spins at frequency f then θ = 2πft.
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Key terms in this lesson
- magnetic field
- A region of space in which a moving charge, current-carrying conductor or magnetic material experiences a force.
- magnetic flux
- The product of the magnetic flux density and the area through which the field lines pass at right angles.
- magnetic flux linkage
- The product of the magnetic flux through a coil and the number of turns on the coil.
- Faraday's law of electromagnetic induction
- The induced electromotive force in a circuit is equal to the rate of change of magnetic flux linkage through the circuit.
More in Electromagnetic Induction
- A Dynamo
- Solenoid
- Lenz's Law
- Faraday's Law of Electromagnetic Induction
- Power Station Alternators
- Back e.m.f.
- Transformers
- Transformer Efficiency
All 12 lessons in Electromagnetic Induction · All OCR A-level Physics topics