Backward wave oscillator – Balanced line – Ball bearing motor – Balun – Band-pass filter – Band-stop filter – Bandwidth (signal processing) – Bang-bang control – Barlow's wheel – Bartlett's bisection theorem – Base load power plant – Battery (electricity) – Battery eliminator – Bayer filter – Beam tetrode – Beat frequency – Beckman Instruments – Bell Telephone Laboratories – Biasing – BIBO stability – Bilinear transform – Bimetallic strip – Biofuel – Biomass – Biomedical engineering – Biot–Savart law – Bipolar junction transistor – Bipolar transistor – Black start – Blocked rotor test – Blu-ray Disc – Bode plot – Boolean algebra (logic) – Boolean algebra (structure) – Boost converter – Booster (electric power) – Bound charge – Braking chopper – Branch circuit – Breakdown voltage – Bridge rectifier – Broadcasting – Brown, Boveri & Cie – Brush (electric) – Brushed DC electric motor – Brushless DC electric motor – Buchholz relay – Buck converter – Buck–boost converter – Buck–boost transformer – Building codes – Bulb – Bunker Ramo Corporation – Busbar – Bushing (electrical) – Butterworth filter – Buzzer –