Cable – Cadmium – Calculus – Canadian electrical code – Canadian Standards Association – Capacitance – Capacitor voltage transformer – Capacitor – Capacitor-input filter – Capacitors – Capacity factor – Carbon offset – Carrier current – Carrier wave – Category 3 cable – Category 5e cable – Category 5e – Category 6 cable – Catenary – Cathode ray oscilloscope – Cathode ray tube – Cathode – Cat's-whisker detector – CATV – Cavity magnetron – magnetron – CCFL inverter – CD – Cegelec – Cell energy – Center tap – Ceramic resonator – Channel (communications) – Charactron – Charge pump – Charge transfer switch – Charge-coupled device – CHAYKA – Chebyshev filter – Chemistry – Choke (electronics) – Chopper (electronic) – Circle diagram – Circuit breaker panel – Circuit breaker – Circuit theory – Circuit Total Limitation (CTL) – Clamp meter – Clapp oscillator – Class of accuracy in electrical measurements – Closed-loop controller – Coal – Coax cable – Coaxial cable – Cochlear implant – Cockcroft–Walton generator – Cogeneration – Cold cathode – Cold work – Colossus (computer) – Combined cycle – Commercial off-the-shelf – Communication system – Communications satellite – Communications server – Commutation cell – Commutator (electric) – Compact fluorescent lamp – Compactron – Compensation winding – Complex conjugate – Complex number – Complex systems – Computational biology – Computational Intelligence – Computed tomography – Computer engineering – Computer hardware – Computer literacy – Computer programming – Computer science – Computer system – Computer – Computer-aided design – Computers – Concentric – Conduction band – Constant k filter – Constitutive equation – Consumer electronics – Contactor – Continuous Fourier transform – Continuous signal – Control engineering – Control systems – Control theory – Controllability – Controller (control theory) – Cooling tower – Copper cable certification – Copper loss – Copper(I) oxide – Copper – Copper-clad aluminum – Copper-clad steel – Cornell University – Corona ring – Corrosion – Coulomb – Coulomb's law – CPU – Creep (deformation) – Crest factor – Crossed-field amplifier – Crosstalk – Cruise control – Crystal oscillator – Ćuk converter – Current (electricity) – Current density – Current division – Current source inverter – Current source – Current transformer – Current-to-voltage converter – Cybernetics – Cyber-physical system – Cycloconverter – Cylinder (geometry) –