Final answer:
The ground symbol in electrical circuit diagrams indicates a connection to the Earth, serving as a reference point for the electrical potential and ensuring safety.
Step-by-step explanation:
The purpose of the ground symbol used in electrical circuit diagrams is to indicate a connection to the Earth. The ground symbol is typically represented by a horizontal line with three vertical lines branching out from it. This symbol indicates that the circuit is connected to the Earth, which serves as a reference point for the electrical potential.
The ground symbol helps to establish a common reference point in circuits, allowing for accurate measurement of voltages and currents. It also helps to ensure safety by providing a path for the electrical current to safely dissipate into the Earth in the event of a fault.