A circuit diagram is a visual representation of an electrical circuit. It uses symbols to depict various components like resistors, capacitors, and power sources, showing how they are connected. This diagram helps engineers and technicians understand the layout and function of the circuit, making it easier to design, troubleshoot, and repair electrical systems. In a circuit diagram, each component is represented by a specific symbol, such as a zigzag line for a resistor or a straight line for a wire. These symbols follow standardized conventions, allowing anyone familiar with electrical engineering to interpret the diagram accurately. Understanding circuit diagrams is essential for working with electronic devices and systems.