- charge buildup
- charge time
- chargeable-cell
- charger
- charging rectifier
- chassis
- checking relay
- characteristic angle
- charge indicator
- charge pump
- charging
- charging current
- charging motor
- charging rate
- charging voltage
- check dam
- check switch
- chemically resistant
- chlohydric acid
- chemical
- chemical capacitor
- chiller
- choke circuit
- choke coil
- choke flange
- chopped wave
- chromium-plating
- circuit analysis
- circuit breaker
- clamping circuit
- chloroprene rubber
- choke feed
- choke plunger
- chopper
- chromaticity
- chrominance subcarrier
- chronograph
- circuit
- circuit closer
- circuit tester
- chorded coil
- circuit grade
- circuit interruption
- circular mil
- circulator
- circulating current
- circulating system
- clamper
- cleaning
- clearance
- clerical error
- climatic test
- clipper
- close
- cloth
- coal analysis
- coal ash
- coal bunker
- coal cleaning
- coal conveyor
- coal equivalent
- coal gasification
- coal mining
- coal preparation
- coal sampling
- coal stockpile
- coal storage
- coal suspension
- coal yard
- coal yield
- coaling yard
- coarse adjustment
- coating
- coaxial load
- coaxial pair
- clinker grinder
- closed contact
- closed core
- closed position
- closed rope
- closing
- closing coil
- closing contact
- closing line
- closing operation
- closing relay
- closing rope
- closing speed
- closing time
- code
- coercitive
- coercive force
- coherent
- coil ignition
- coil inductance
- coil loss
- coil winding
- coiled coil
- collection
- collective control