What does a schematic diagram represent?

A schematic diagram serves as a graphical representation of an electrical circuit, depicting the various components such as resistors, capacitors, switches, and power sources, along with their interconnections. This clarity allows engineers and technicians to understand the layout and functionality of a circuit without needing to see the physical arrangement of the components. The use of standardized symbols in schematic diagrams helps convey complex information in a comprehensible manner, making it easier to troubleshoot, design, and analyze electrical circuits.

The other options delve into aspects of electrical circuits but do not accurately capture the essence of a schematic diagram. A written description relates to the functionality of a circuit but lacks the visual component integral to a schematic. A physical map would refer to a tangible representation of a circuit's location, which is not the purpose of a schematic. Similarly, while a visual depiction of current flow could be part of circuit analysis, it does not encompass the broader function of a schematic diagram, which primarily focuses on the arrangement and connections of components.