Electromagnetic Induction and Alternating Current

Φ = B·A·cosθ as the central quantity of induction.

Rate of change of flux equals induced EMF.

Induced current opposes the change — a statement of energy conservation.

EMF generated by a rod moving through a magnetic field.

EMF induced in a coil by change in its own current.

Coupling between two coils; basis of the transformer.

Sinusoidal EMF from a rotating coil in a magnetic field.

Relation between peak, RMS, and average for sinusoidal AC.

Phasors, impedance Z, and resonance condition.

Voltage ratio equals turns ratio; rationale for high-V transmission.