Hello friends, I hope you are doing well. In this tutorial, we will compare alternating current and direct current, calculate power in both systems and explain why modern electrical networks use each form. AC and DC describe the direction and time variation of voltage and current. Power is the rate at which electrical energy is transferred. The phrase “AC power” therefore means power carried by alternating voltage and current, while “DC power” means power carried by quantities with fixed polarity. Figure: A conceptual image introduces the comparison of alternating and direct current. AC and DC at a Glance Feature DC AC Polarity Remains fixed Reverses periodically Typical waveform Constant or varying unidirectionally Sinusoidal or another bipolar waveform Frequency Zero for ideal steady DC ...