H, symbol for magnetic field intensity | Historical, nonmechanical memory technologies |

half-adder | Half-Adder |

Half-bridge circuit | Strain gauges |

Half-wave rectification | Other waveshapes |

| Half-wave rectifier |

half-wave rectifier | Rectifier circuits |

| Half-wave rectifier |

Hall effect | Power measurement |

Hall-effect sensor | Ammeter impact on measured circuit |

Hardware vs. Software | Look-up tables |

Harmonic | Standing waves and resonance |

| Harmonics in Polyphase Power Systems |

| Introduction |

| The TRIAC |

Harmonic sequence | Harmonic phase sequences |

Harmonic, even vs. odd | Harmonics in Polyphase Power Systems |

| More on spectrum analysis |

| The TRIAC |

Harmonics | Musical keyboard as a signal generator |

Harmonics and waveform symmetry | Harmonics in Polyphase Power Systems |

| More on spectrum analysis |

| The TRIAC |

Harmonics, triplen | Harmonics in Polyphase Power Systems |

| Harmonic phase sequences |

Headphone | Sensitive voltage detector |

Heat sink | Rectifier/filter circuit |

Heater, overload | Contactors |

Heating, dielectric | Capacitor quirks |

Heating, inductive | Inductor quirks |

Hecto | Metric notation |

Henry | Magnetic fields and inductance |

| AC Inductor Circuits |

Heptode | Combination tubes |

Hertz | Ohm's Law (again!) |

| Conductance |

Hexadecimal numeration | Octal and hexadecimal numeration |

hfe | Active mode operation |

Hi-pot tester | High voltage ohmmeters |

High voltage breakdown of insulation | High voltage ohmmeters |

High, logic level | Digital signals and gates |

High-impedance output, tristate | Special-output gates |

high-impedance voltmeter | High-impedance voltmeter |

high-level programming language | Microprocessor programming |

high-pass filter | High-pass filters |

HiPAC-EDT | Infineon HiPAC-EDT |

history | Early tube history |

hold time, shift register | Shift Register, Serial-in/Serial-out |

holding current | The Silicon-Controlled Rectifier (SCR) |

Holding current, thyristor | Solid-state relays |

home lab | Setting up a Home Lab |

horsepower | Power in electric circuits |

Hot conductor | Single-phase power systems |

Hot wire | Safe circuit design |

Hot-cathode tube | Ionization (gas-filled) tubes |

HPIB | Short-distance busses |

Hybrid parameters | Active mode operation |

hydrometer | Electron activity in chemical reactions |

Hyperbolic function, trigonometry | Complex number arithmetic |

Hyperbolic functions | Trigonometry Reference |

Hypotenuse | Trigonometry Reference |

Hysteresis | Permeability and saturation |

| Ionization (gas-filled) tubes |

| Positive feedback |

| Hysteresis |

| NOR gate S-R latch |

| Energy losses |

| Hysteresis and Eddy Current |

hysteresis motor | Other specialized motors |

Hz (unit) | AC Waveforms |