| B&S (Brown and Sharpe) | Conductor size |
| B, symbol for magnetic flux density | Historical, nonmechanical memory technologies |
| banana plugs and jacks | Precision potentiometer |
| Band, electron | Band theory of solids |
| band-elimination filter | Band-stop filters |
| band-pass filter | Band-pass filters |
| band-reject filter | Band-stop filters |
| band-stop filter | Band-stop filters |
| bandwidth | Electrical signal types |
| bandwidth, amplifier | Feedback |
| Barrier strip | Building simple resistor circuits |
| | Building series-parallel resistor circuits |
| Base, numeration system | Systems of numeration |
| BASIC computer language | Microprocessor programming |
| BASIC, computer language | Using the Spice Circuit Simulation Program |
| Battery | Voltage and current |
| | Electron activity in chemical reactions |
| | Battery construction |
| | Practical considerations |
| Battery capacity | Battery ratings |
| baud, unit | Electrical signal types |
| Beam power tube | Beam power tubes |
| Bel | Decibels |
| beta | Transistor Ratings |
| Beta ratio | Active mode operation |
| | Current mirrors |
| | Current mirror |
| Beta ratio, bipolar transistor | Tube parameters |
| Beta variations | Active mode operation |
| Bias current, op-amp | Practical considerations: bias current |
| | Integrator |
| bias, diode | Introduction |
| bias, transistor | The common-emitter amplifier |
| | Biasing techniques |
| biasing techniques | Practical Biasing Techniques |
| bifilar winding | Creating custom calibration resistances |
| Bilateral | Active-mode operation |
| Bilateral switch | Special-output gates |
| bimetallic strip | Fuses |
| binary number | Binary count sequence |
| | Binary addition |
| | Negative binary numbers |
| | Subtraction |
| | Decimal versus binary numeration |
| Binary numeration | Systems of numeration |
| Binary point | Decimal versus binary numeration |
| binding posts | Precision potentiometer |
| Bipolar-mode MOSFET | IGBTs |
| bistable | Positive feedback |
| bistable multivibrator | Digital logic with feedback |
| Bit | Bit groupings |
| Bit bobble | Tracking ADC |
| Bit, binary | Systems of numeration |
| Bit, least significant | Decimal versus binary numeration |
| Bit, most significant | Decimal versus binary numeration |
| bitwise arbitration | Network protocols |
| Block, terminal | Building simple resistor circuits |
| Bluetooth | Short-distance busses |
| Bode plot | What is a Filter? |
| | Simple parallel (tank circuit) resonance |
| Bohr's atomic model | Bohr's Atomic Model |
| bond | Electron activity in chemical reactions |
| Bonded strain gauge | Strain gauges |
| Boolean Algebra | Digital logic functions |
| Boosting, AC voltage sources | Single-phase power systems |
| Boosting, transformer connection | Winding configurations |
| Bounce, switch contact | Monostable multivibrators |
| | Contact "bounce" |
| | NAND gate S-R flip-flop |
| | LED sequencer |
| bps, unit | Electrical signal types |
| Branch Current analysis | Branch current method |
| Breadboard | Ohmmeter usage |
| Breadboard, solderless | Building simple resistor circuits |
| | Building series-parallel resistor circuits |
| Break-before-make | Contact "normal" state and make/break sequence |
| breakdown | The Shockley Diode |
| | Diode Characteristic |
| Breakdown, insulation | Insulator breakdown voltage |
| | High voltage ohmmeters |
| breakover | The Shockley Diode |
| Bridge circuit | Bridge circuits |
| | AC Bridge Circuits |
| | AC Instrumentation Transducers |
| Bridge circuit, "full" | Strain gauges |
| Bridge circuit, "half" | Strain gauges |
| Bridge circuit, "quarter" | Strain gauges |
| bridge rectifier | Rectifier circuits |
| Bridge, Kelvin Double | Bridge circuits |
| Bridge, Wheatstone | Bridge circuits |
| Broadcast, digital network | Network topology |
| brush | What is alternating current (AC)? |
| brushless DC motor | Brushless DC motor |
| Bubble memory | Historical, nonmechanical memory technologies |
| Bubble, gate symbol | Digital signals and gates |
| Bucking, AC voltage sources | Single-phase power systems |
| Bucking, transformer connection | Winding configurations |
| buffer | Gate universality |
| Buffer gate | The "buffer" gate |
| Buffer gate, open-collector TTL | The "buffer" gate |
| Buffer gate, totem pole TTL | The "buffer" gate |
| bus | Networks and busses |
| | Short-distance busses |
| Bus topology | Network topology |
| Busbar | Conductor size |
| bypass capacitor | Feedback |
| Byte | Bit groupings |