Linked from
The 12 pages that link to Ground (electricity), each with the reason it gives.
VoltageRelated: Voltage measurements require a stated reference point.
Electric potentialRelated: Circuit potentials are commonly reported relative to ground.
Direct currentRelated: A defined reference helps specify voltages and return paths in DC systems.
Static electricityRelated: Grounding gives excess charge a path to dissipate.
Crystal radioRelated: A ground connection completes the radio-frequency circuit with the antenna.
Miller theoremRelated: The theorem’s replacement branches terminate at this reference node.