An electrical DC circuit is a closed loop through which direct current (DC) flows. DC is the continuous flow of electric charge in one direction, typically from a power source such as a battery or a DC power supply.

In a DC circuit, the flow of current is unidirectional, meaning it flows from the positive terminal of the power source to the negative terminal. The circuit consists of various components such as resistors, capacitors, inductors, and switches, which are connected in series or parallel to form the desired circuit configuration.

The behavior of a DC circuit is governed by Ohmâ€™s law, which states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. This relationship is expressed by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

DC circuits are commonly used in various applications, including power distribution systems, electronic devices, and automotive electrical systems. They are also used in renewable energy systems such as solar panels and wind turbines, where DC power is generated and converted into AC power for use in homes and industries.