| 1-to-2 demultiplexer | Demultiplexers |
| 1-to-2 line decoder | Decoder |
| 1-to-4 demultiplexer | Demultiplexers |
| 10-50 milliamp signal | Current signal systems |
| | Voltage-to-current signal conversion |
| 164, SN74ALS164A | Serial-in, parallel-out shift register |
| 166, SN74ALS166 | Shift Register, Parallel-in, Serial-out |
| 2-to-1 multiplexer | Multiplexers |
| 3-bit binary counter | 3-Bit Binary Counter |
| 4-20 mA analog signal | Introduction |
| 4-20 milliamp signal | Current signal systems |
| | Voltage-to-current signal conversion |
| 4-layer diode | The Shockley Diode |
| 4-to-1 multiplexer | Multiplexers |
| 4-wire resistance measurement | Kelvin (4-wire) resistance measurement |
| | 4-Wire Resistance Measurement |
| 400 Hz AC power, aircraft | Energy losses |
| 4017, CD4017, 74HC4017, Johnson counter | Ring Counters |
| | Johnson Counters |
| 4022, CD4022, Johnson counter | Ring Counters |
| | Johnson Counters |
| 4094, 74HCT4094 ANSI symbol | Serial-in, parallel-out shift register |
| 4PDT switch | Contact "normal" state and make/break sequence |
| 555 audio oscillator | 555 Audio Oscillator |
| 555 ramp generator | 555 Ramp Generator |
| 555 timer | 555 Audio Oscillator |
| | 555 Ramp Generator |
| | PWM power controller |
| 555 timer ic | The 555 IC |
| 594, 74AHC594 | Serial-in, parallel-out shift register |
| 594, 74AHC594 ANSI symbol | Serial-in, parallel-out shift register |
| 595, 74AHC595 | Serial-in, parallel-out shift register |
| 595, 74AHC595 ANSI symbol | Serial-in, parallel-out shift register |
| 7-segment display | 7-Segment Display |
| | Encoder |
| 7-segment encoder | Encoder |
| 741 operational amplifier | The "operational" amplifier |
| 74LS299 | PIPO Universal Devices |
| | PIPO Practical Applications |
| 74LS395 | Parallel-In, Parallel-Out, Universal Shift Register |
| | PIPO Universal Devices |
| A | CMOS gate circuitry |
| A/D converter | The "operational" amplifier |
| ABEL | Introduction |
| absolute dB scales | Absolute dB Scales |
| Absolute value, vector | Polar and rectangular notation |
| absolute Zero | Superconductivity |
| AC | Voltage and current |
| | What is alternating current (AC)? |
| | Introduction |
| AC bridge | AC Bridge Circuits |
| AC circuit analysis | Summary |
| AC commutator motor | AC commutator motors |
| AC coupling, oscilloscope | Signal coupling |
| | Half-wave rectifier |
| AC measurement | Measurements of AC magnitude |
| AC motor | Introduction |
| AC power supply | Transformer -- power supply |
| AC-DC power supply | The Silicon-Controlled Rectifier (SCR) |
| Acid | pH measurement |
| active device | Active Versus Passive Devices |
| Active mode, transistor | Active mode operation |
| Active-high input | 7-Segment Display |
| Active-low input | 7-Segment Display |
| ADC | Resolution of ADC circuits |
| ADC, delta-sigma | Delta-Sigma ADC |
| ADC, digital ramp | Digital ramp ADC |
| ADC, flash | Flash ADC |
| ADC, integrating | Slope (integrating) ADC |
| ADC, slope | Slope (integrating) ADC |
| ADC, successive approximation | Successive approximation ADC |
| ADC, tracking | Tracking ADC |
| adder | Full-Adder |
| Adjacent | Trigonometry Reference |
| admittance | Susceptance and Admittance |
| alarm | PIPO Practical Applications |
| Algebra, Boolean | Digital logic functions |
| Algebraic identities | Algebra Reference |
| Algebraic sum | Kirchhoff's Voltage Law (KVL) |
| Aliasing, ADC | Practical considerations of ADC circuits |
| alligator clip | Voltmeter usage |
| Alligator clips | Kelvin (4-wire) resistance measurement |
| alpha | Transistor Ratings |
| alpha ratio | The common-base amplifier |
| | Current mirrors |
| Alternating current | Voltage and current |
| | What is alternating current (AC)? |
| | Introduction |
| Alternator | Three-phase power systems |
| | What is alternating current (AC)? |
| | Automotive alternator |
| ALU | Look-up tables |
| Ammeter | Safe meter usage |
| | Ammeter design |
| | AC Voltmeters and Ammeters |
| Ammeter impact | Ammeter impact on measured circuit |
| ammeter usage | Ammeter usage |
| Ammeter, clamp-on | Ammeter impact on measured circuit |
| Amp | Scientific notation |
| | Ammeter usage |
| Amp-hour | Battery ratings |
| Amp-turn (unit) | Mutual inductance and basic operation |
| Ampacity | Conductor and Insulator Tables |
| | Conductor ampacity |
| ampere | Ammeter usage |
| Ampere (unit) | How voltage, current, and resistance relate |
| Amplified voltmeter | Voltmeter impact on measured circuit |
| Amplifier | Voltmeter impact on measured circuit |
| | Special transformers and applications |
| | Noninverting amplifier |
| | Practical Biasing Techniques |
| | Amplifiers |
| Amplifier circuit | A Very Simple Computer |
| amplifier gain | Amplifier Gain |
| amplifier impedance | Voltage Follower |
| Amplifier, differential | Single-ended and differential amplifiers |
| Amplifier, inverting | Divided feedback |
| | Common-Emitter Amplifier |
| Amplifier, noninverting | Divided feedback |
| amplifier, operational | Multi-Stage Amplifier |
| Amplifier, single-ended | Single-ended and differential amplifiers |
| amplitude | Measurements of AC magnitude |
| | Musical keyboard as a signal generator |
| amplitude modulation | Electrical signal types |
| amplitude, AC | AC Voltmeters and Ammeters |
| amplitude, vector | Vectors and AC waveforms |
| Analog | Introduction |
| | Introduction |
| Analog computer | A Very Simple Computer |
| | Rate-of-change indicator |
| analog multimeter | Voltmeter usage |
| analog signal | Analog Signals |
| Analog signal, 4-20 mA | Introduction |
| Analog-to-digital converter | The "operational" amplifier |
| Analysis, AC circuit | Summary |
| Analysis, Branch Current method | Branch current method |
| Analysis, Fourier | Square wave signals |
| Analysis, frequency domain | Square wave signals |
| Analysis, Mesh Current method | Mesh current method |
| Analysis, network | What is network analysis? |
| Analysis, parallel | Parallel R, L, and C |
| Analysis, qualitative | Component failure analysis |
| | Component failure analysis |
| Analysis, series | Series R, L, and C |
| Analysis, series-parallel | Analysis technique |
| | Series-parallel R, L, and C |
| | Summary |
| Analyzer, spectrum | Square wave signals |
| AND | Gate universality |
| AND gate | AND gate |
| AND gate, TTL | TTL NAND and AND gates |
| Angle, vector | Polar and rectangular notation |
| angular momentum quantum number | Angular Momentum Quantum Number |
| Angular velocity | Harmonics in Polyphase Power Systems |
| | AC Capacitor Circuits |
| | AC Inductor Circuits |
| ANSI gate symbols | Shift Register, Parallel-in, Serial-out |
| ANSI protective relay designations | Protective relays |
| antenna | More on the "skin effect" |
| | Principles of radio |
| Anti-static foam | Meter check of a transistor |
| Antiderivative of e functions | Calculus Reference |
| Antiderivatives | Calculus Reference |
| Antinode | Standing waves and resonance |
| antiresonance | Resonance in series-parallel circuits |
| | Inductor-capacitor "tank" circuit |
| apparent power | True, Reactive, and Apparent Power |
| Arithmetic Logic Unit | Look-up tables |
| Arithmetic sequence | Algebra Reference |
| Arithmetic, with complex numbers | Complex number arithmetic |
| Arm, Wheatstone bridge | Bridge circuits |
| Armature | Relay construction |
| Artifact, measurement | More on spectrum analysis |
| | Computational circuits |
| assembler, computer programming | Microprocessor programming |
| assembly language | Microprocessor programming |
| Associative property | Boolean algebraic properties |
| astable | Positive feedback |
| astable multivibrator | Digital logic with feedback |
| | 555 Audio Oscillator |
| | Audio Oscillator |
| Asymptotic | Capacitor transient response |
| | Inductor transient response |
| Asynchronous counter | Asynchronous counters |
| asynchronous load, shift register | Shift Register, Parallel-in, Serial-out |
| atom | Static electricity |
| atomic clock | Frequency and Phase Measurement |
| atomic structure | Static electricity |
| | Electron activity in chemical reactions |
| | Introduction |
| attenuation | Band-pass filters |
| Attenuators | Attenuators |
| Atto | Metric notation |
| audio detector | Sensitive audio detector |
| audio oscillator | Audio Oscillator |
| audio taper | Potentiometer as a Voltage Divider |
| audio taper potentiometer | Sensitive audio detector |
| | Sensitive voltage detector |
| autoranging meter | Voltmeter usage |
| Autotransformer | Winding configurations |
| average amplitude, AC | Measurements of AC magnitude |
| Averager | Averager and summer circuits |
| AWG (American Wire Gauge) | Conductor size |