What is dc meaning?

DC refers to direct current. It is a type of electrical current that flows in one direction only and has a constant voltage polarity. DC current is commonly used in devices that require a steady and consistent power supply, such as electronic circuits, batteries, and some motors. Unlike alternating current (AC), which periodically reverses direction, DC current maintains a constant polarity and flow. This makes it useful for applications that require precise control, such as in telecommunications, aerospace, and medical devices. The voltage of DC current can be adjusted using devices such as resistors and transformers.