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 flux
- The product of the magnetic flux density and the area through which the field passes at right angles to it, measured in weber.
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 AQA A-level Physics topics