- box
- blow fuse
- blowing out
- blown fuse
- blowout fuse
- bobbin winding
- body capacitance
- boiler efficiency
- boiler house
- boiler system
- bolometer
- bolt
- bond
- bonding strip
- booster
- booster dynamo
- booster transformer
- boring machine
- bracket
- Bragg cell
- braided
- braided wire
- brake cable
- brake dynamo
- branch
- break down
- breaking capacity
- brightness control
- brazing
- break time
- breakdown test
- breakdown torque
- breaker
- breather
- breeches joint
- bridge arm
- bridge circuit
- bridge Wheatstone
- brightness level
- brush position
- brush rocker
- brush yoke
- broad tuned
- brush effect
- brush shift
- bubble point
- buffer
- bulk cargo
- bucking coil
- buffer battery
- bunched cable
- bunching
- buried wire
- burnout rate
- bus bar
- bus divider
- bus line
- bus protection
- busbar
- bushing
- bushing adapter
- branch current
- branch office
- brass
- breadboard model
- break distance
- breakdown
- breaking current
- bridge connection
- bridge rectification
- bridge resistor
- bridge transition
- bridging
- bridging contact
- brightness signal
- broadcasting
- brush ring
- brush selector
- braid
- braking
- branch line
- branch terminal
- break
- break contact
- breaker protection
- bridge
- bridge balancing
- buffer dynamo
- bunch filament
- bundle conductor
- bundled cable
- burden
- burn
- burn out
- burner
- burning channel
- burnout
- bus
- bus coupler
- busbar coupler