| G, symbol for conductance | Conductance |
| Gage size, wire | Conductor and Insulator Tables |
| gain | Amplifier Gain |
| | Decibels |
| galvanometer | What is a meter? |
| gate | Multiple-input gates |
| gate shape, ANSI symbols | Shift Register, Parallel-in, Serial-out |
| Gate, complementary output | Special-output gates |
| Gate, digital | Digital signals and gates |
| Gate-Controlled Switch | The Silicon-Controlled Rectifier (SCR) |
| Gate-Turn-Off thyristor | The Silicon-Controlled Rectifier (SCR) |
| Gated S-R latch | The gated S-R latch |
| gateway network device | Network protocols |
| Gauge, wire size | Conductor size |
| gauss (unit) | Magnetic units of measurement |
| GCS | The Silicon-Controlled Rectifier (SCR) |
| Generator | Three-phase power systems |
| | What is alternating current (AC)? |
| | Automotive alternator |
| | Voltmeter usage |
| Generator, AC signal | Musical keyboard as a signal generator |
| GFCI | Common sources of hazard |
| | Safe circuit design |
| Giga | Metric notation |
| gilbert (unit) | Magnetic units of measurement |
| Glass fiber | Optical data communication |
| Glow tube | Ionization (gas-filled) tubes |
| GPIB | Short-distance busses |
| graphene transistor | Graphene Transistor |
| Graphic equalizer | Square wave signals |
| Gray code | Logic simplification with Karnaugh maps |
| grid | Early tube history |
| ground | Shock current path |
| | Vectors and AC waveforms |
| | Single-ended and differential amplifiers |
| Ground fault | Troubleshooting -- Theory and Practice |
| | Shock current path |
| | Common sources of hazard |
| | Safe circuit design |
| Ground Fault Current Interrupter | Common sources of hazard |
| | Safe circuit design |
| Ground, virtual | Divided feedback |
| grounding | Shock current path |
| GTO | The Silicon-Controlled Rectifier (SCR) |
