Learn how root mean square value provides a single, comparable measure for AC voltage or current by squaring, averaging, and taking the square root to match DC power.

Explore phasor representation of alternating quantities as rotating vectors encoding magnitude, phase angle, and frequency. See how phasors depict sine wave forms and relate voltage and current in AC analysis.

Explore power factor and distinguish active power from reactive power in residential and industrial inductive loads. See magnetizing and working currents form apparent power, and power factor indicates efficiency.

Explore the transformer operating principle, including self and mutual induction, Faraday's law, magnetic flux in a shared iron core, and how primary and secondary windings regulate flux and load.