Electromagnetism
Magnetic fields, flux, induction and magnetic circuits — the physics behind every motor, generator and transformer.
Electric currents create magnetic fields, and changing magnetic fields induce voltages. These two facts make energy conversion between electrical and mechanical forms possible.
Sub-topics (5)
Magnetic Field and Flux
Field strength H, flux density B and flux Φ, and the permeability linking them.
Faraday's Law and Lenz's Law
A changing magnetic flux induces an EMF that opposes the change.
Magnetic Circuits
Analyse cores like electric circuits: MMF drives flux through reluctance.
Hysteresis and Eddy Current Losses
Iron cores waste energy by repeatedly magnetising (hysteresis) and by induced circulating currents (eddy currents).
Force on a Current-Carrying Conductor
A conductor carrying current in a magnetic field experiences a force F = BIl — the principle of the motor.
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