What is the function of the sending unit in an electrical system?

The sending unit's primary role in an electrical system, particularly in automotive contexts, is to provide an electrical signal to the fuel level gauge. This unit typically consists of a float mechanism that moves with the fuel level in the tank. As the float rises and falls with the fuel level, it changes the resistance in the sending unit, which in turn sends a corresponding electrical signal to the gauge on the dashboard. This electrical signal translates into a visual representation on the gauge, allowing the driver to monitor the fuel level effectively.

While monitoring engine temperature, controlling engine speed, and measuring voltage levels are vital functions within an electrical system, they pertain to different components. The sending unit is specifically associated with gauging fuel levels, making the second choice the most accurate reflection of its purpose.