What are the four main electrical units?

The four main electrical units are voltage (measured in volts), current (measured in amperes or amps), resistance (measured in ohms), and power (measured in watts). Voltage represents the potential difference that drives electric charge flow, current is the rate of flow of electric charge, resistance quantifies how much a material opposes the flow of current, and power indicates the rate at which electrical energy is consumed or converted. These units are fundamental for understanding and analyzing electrical circuits.