A DC circuit (Direct Current circuit) is an electrical circuit that provides a constant flow of electric charge in one direction. This type of circuit is commonly used in batteries, where the voltage remains steady over time. Components like resistors, capacitors, and inductors can be found in DC circuits, affecting how the current flows and how energy is stored. In a DC circuit, the voltage and current can be measured using tools like a multimeter. The basic principles governing these circuits include Ohm's Law, which states that voltage equals current times resistance (V = IR). Understanding these principles is essential for designing and troubleshooting electrical systems.