Gain scheduling – Galvanic corrosion – Galvanometer – Gas-filled tube – Gate turn-off thyristor (GTO) – Gauss's law – Gauss-Seidel method – General Electric Company plc – General Electric – General Radio Corporation – Generator (circuit theory) – Geographic information systems – Georgia School of Technology – Geoscience – Geothermal power – Germanium – Gigabit – Global Positioning System – Gold – Governor (device) – GPS – Gradient descent – Grid energy storage – Grid-tie inverter – Ground (electricity) – Ground and neutral – Ground-level power supply – Growler (electrical device) – GSM – Gunn diode – Gyrotron –