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A DC coupling is a method used to connect two systems or circuits, allowing direct current (DC) signals to pass through while preventing alternating current (AC) signals from interfering. In electrical systems, DC coupling is often used in situations where direct transfer of power or signals is needed, such as in power supplies, instrumentation, and certain types of generators or motors.
In DC coupling, the connection allows a constant flow of direct current between components, ensuring a steady voltage level, and is especially useful when AC noise could affect the performance of the system. This technique is commonly used in applications like solar energy systems, DC motors, and other low-voltage circuits where stable, uninterrupted current is critical.