Which of the following statements are correct for the power factor in an AC circuit? S1: For a purely resistive load, power factor is zero. S2: Leading power factor implies a capacitive load. S3: Lagging power factor implies an inductive load.

An alternating voltage source of variable angular frequency ω and fixed amplitude V is connected in series with a capacitance C and an electric bulb of resistance R (zero inductance). When ω is increased, what happens to the brightness of the bulb?

An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) AC source. The power dissipated in the circuit is: