The instantaneous power (P) across a 200 Ω resistor having an alternating voltage V = 20 sin(300t) Volts is given by which of the following expressions?

In an inductive circuit, a resistance of 2 Ω is connected in series with an inductor having an inductive reactance of 4 Ω. Determine the power factor of the circuit when connected to a single-phase AC supply.

A capacitor draws a reactive power of 100 VAR due to a current of 0.87 A. Determine the capacitive reactance (XC) of the capacitor.