The voltage and current are in phase for it and some of the power it dissipates is coming from the capacitor’s stored charge. Circuits The magnitude of the vector is usable in Ohm’s law.

A phase-locked loop (PLL) is a feedback system that combines a voltage-controlled oscillator (VCO) and a phase detector in such a way that the oscillator signal tracks an applied frequency or ...

Read Part 1 and Part 2 of this series. This article on FETs for voltage controlled circuits will cover FET modulator circuits and variable gain amplifier ...