| C (unit) | AC Waveforms |
| C, computer language | Using the Spice Circuit Simulation Program |
| C, symbol for capacitance | Electric fields and capacitance |
| C/C++ | Microprocessor programming |
| cable, coaxial | A 50-Ohm Cable? |
| CAD | Introduction |
| CADET computer | Look-up tables |
| cadmium cell | Mercury Standard Cells |
| calculator | Hand calculator use |
| Calculus | Capacitors and calculus |
| | Inductors and calculus |
| | Electromagnetic induction |
| | AC Capacitor Circuits |
| | AC Inductor Circuits |
| | Computational circuits |
| | The "operational" amplifier |
| | Differentiator and integrator circuits |
| | Integrator |
| | Rate-of-change indicator |
| Calculus, derivative function | Capacitors and calculus |
| | Inductors and calculus |
| Calibration "drift" | Rheostat range limiting |
| capacitance | Electric fields and capacitance |
| | Factors affecting capacitance |
| | AC Capacitor Circuits |
| | Diode ratings |
| | Varactor Diode |
| Capacitance equation | Capacitor sizing equation |
| Capacitive coupling | Introduction |
| | Circuit effects |
| | Input and output coupling |
| capacitive reactance | AC Capacitor Circuits |
| capacitor | Electric fields and capacitance |
| | AC Capacitor Circuits |
| | Capacitor Charging and Discharging |
| capacitor, bypass | Feedback |
| Capacitor, decoupling | Signal coupling |
| Capacitor, electrolytic | Practical considerations |
| Capacitor, op-amp compensation | Frequency Response |
| Capacitor, tantalum | Practical considerations |
| capacitor, variable | Factors affecting capacitance |
| | AC Instrumentation Transducers |
| Capacitors, nonpolarized | Practical considerations |
| Capacitors, polarized | Practical considerations |
| Capacitors, series and parallel | Series and parallel capacitors |
| Capacity, battery | Battery ratings |
| carbon nanotube transistor | Carbon Nanotube Transistor |
| cardiac defibrillation | Physiological effects of electricity |
| Cardio-Pulmonary Resuscitation | Emergency response |
| Carrier, strain gauge | Strain gauges |
| Carrier-Sense Multiple Access | Network protocols |
| carry | Half-Adder |
| | Full-Adder |
| cat-eye tube | Display tubes |
| Cathode | The triode |
| cathode ray tube | What is a meter? |
| | AC Voltmeters and Ammeters |
| | Display tubes |
| | Historical, nonmechanical memory technologies |
| Caustic | pH measurement |
| Cb (unit) | Static electricity |
| CCD | Historical, nonmechanical memory technologies |
| cell | Electron activity in chemical reactions |
| | Battery construction |
| Celsius | AC Waveforms |
| Celsius (temperature scale) | Conductance |
| center-tap rectifier | Rectifier circuits |
| | Full-wave center-tap rectifier |
| Centi | Metric notation |
| Centigrade | Conductance |
| | AC Waveforms |
| Central Processing Unit | Microprocessors |
| Centronics parallel bus | Short-distance busses |
| cgs system | Magnetic units of measurement |
| Characteristic curves, transistor | Active-mode operation |
| | Active mode operation |
| Characteristic impedance | Characteristic impedance |
| charge | Static electricity |
| charge, definition | Static electricity |
| Charge-Coupled Device | Historical, nonmechanical memory technologies |
| charging | Capacitor Charging and Discharging |
| charging of battery | Practical considerations |
| charging, capacitor | Electric fields and capacitance |
| Charging, inductor | Magnetic fields and inductance |
| check valve | Introduction |
| chemical detection cell | Chemical Detection Cell |
| chip | Resistors |
| Choke | Magnetic fields and inductance |
| | Inductor-capacitor "tank" circuit |
| Choke, filter | Rectifier/filter circuit |
| Cipher | Systems of numeration |
| circuit | Electric Circuits |
| | A Very Simple Circuit |
| Circuit breaker | Safe practices |
| | Fuses |
| Circuit, closed | Resistance |
| Circuit, equivalent | Practical considerations |
| | Thevenin's Theorem |
| | Thevenin-Norton equivalencies |
| | Delta-Y and Y-Delta Conversions |
| | Practical considerations |
| Circuit, open | Resistance |
| Circuit, short | Resistance |
| | A Very Simple Circuit |
| Circuits, nonlinear | Thevenin's Theorem |
| Circular mil | Conductor size |
| Clamper circuit | Clamper circuits |
| class A amplifier operation | Biasing techniques |
| class AB amplifier operation | Biasing techniques |
| class B amplifier operation | Biasing techniques |
| class B audio amplifier | Class B audio amplifier |
| class C amplifier operation | Biasing techniques |
| class D amplifier operation | Biasing techniques |
| class, amplifier operation | Biasing techniques |
| Class, transformer heat rating | Heat and Noise |
| clipper circuit | Clipper circuits |
| clock | Introduction to Shift Registers |
| clock signal | Edge-triggered latches: Flip-Flops |
| Closed circuit | Resistance |
| clutch | Other specialized motors |
| Cmil | Conductor size |
| CMOS | CMOS gate circuitry |
| CMRR | Common-Mode Gain |
| CNC machine tool control | Microprocessors |
| coaxial cable | A 50-Ohm Cable? |
| coherent light | Laser diodes |
| Cold-cathode tube | Ionization (gas-filled) tubes |
| collector current | Transistor Ratings |
| collision | Network protocols |
| color code | Resistor Color Codes |
| | Ohmmeter Usage |
| combinational logic | Combinational Logic |
| COMFET | IGBTs |
| Common difference | Algebra Reference |
| Common logarithm | pH measurement |
| common-base amplifier | The common-base amplifier |
| Common-collector amplifier | The common-collector amplifier |
| common-emitter amplifier | The common-emitter amplifier |
| | Common-Emitter Amplifier |
| Common-mode rejection ratio | Common-Mode Gain |
| common-mode voltage | Electrical isolation |
| | Common-Mode Gain |
| | Differential Amplifier |
| commonality, electrical | Ohmmeter Usage |
| communications gateway | Network protocols |
| Commutating diode | Inductor commutating circuits |
| | Commutating diode |
| Commutation | Inductor commutating circuits |
| commutation time | Diode ratings |
| commutation, forced | The Silicon-Controlled Switch (SCS) |
| commutation, natural | The Silicon-Controlled Switch (SCS) |
| Commutative property | Boolean algebraic properties |
| commutator motor | AC commutator motors |
| compactPCI bus | Short-distance busses |
| Comparator | The "operational" amplifier |
| Compensation capacitor, op-amp | Frequency Response |
| Compensation, thermocouple reference junction | Thermocouples |
| Compiler | Using the Spice Circuit Simulation Program |
| | Microprocessor programming |
| Complement, one's | Negative binary numbers |
| Complement, two's | Negative binary numbers |
| Complementary output gate | Special-output gates |
| Complementation, numerical | Negative binary numbers |
| Complex number | Introduction |
| | AC Phase |
| | Power in resistive and reactive AC circuits |
| Complex number arithmetic | Complex number arithmetic |
| complex vector addition | Complex vector addition |
| computer automated design | Introduction |
| Computer simulation | Computer simulation of electric circuits |
| | Voltage divider |
| Computer, analog | A Very Simple Computer |
| | Rate-of-change indicator |
| Condenser | Switch contact design |
| | Synchronous Condenser |
| condenser (or condensor) | Electric fields and capacitance |
| Conductance | Conductance |
| | Susceptance and Admittance |
| conduction | Current flow in a Semiconductor |
| Conduction band | Band Theory of Solids |
| conduction in gases | Nonlinear Conduction |
| Conductivity | Conductors, insulators, and electron flow |
| Conductivity, earth | Common sources of hazard |
| Conductivity-Modulated Field-Effect Transistor | IGBTs |
| Conductor | Conductors, insulators, and electron flow |
| | Introduction |
| Conductor ampacity | Conductor and Insulator Tables |
| | Conductor ampacity |
| Conductor, "ground" | Safe circuit design |
| Conductor, "hot" | Safe circuit design |
| | Fuses |
| Conductor, "neutral" | Safe circuit design |
| | Fuses |
| Conservation of Energy, Law of | Step-up and step-down transformers |
| Constant-current diode | Active mode operation |
| | JFET Current Regulator |
| | Constant-current diodes |
| Constants, mathematical | Algebra Reference |
| Contact bounce | Contact "bounce" |
| | NAND gate S-R flip-flop |
| | LED sequencer |
| Contact debouncing | Contact "bounce" |
| Contact, seal-in | Motor control circuits |
| | Programmable logic controllers |
| Contact, switch | Switch contact design |
| Contactor | Contactors |
| Continuity | Conductors, insulators, and electron flow |
| | Safe meter usage |
| | Ohmmeter Usage |
| continuity vs. commonality | Ohmmeter Usage |
| controlled rectifier | The Silicon-Controlled Rectifier (SCR) |
| conventional flow | Conventional versus electron flow |
| | Introduction |
| Conversion factor | Metric prefixes and unit conversions |
| conversion rate | Nykquist Frequency |
| Conversion rate, ADC | Practical considerations of ADC circuits |
| Cooper pairs | Superconductivity |
| copyright | Copyright |
| core loss | Resonance in series-parallel circuits |
| Cosines, law of | Trigonometry Reference |
| Coulomb | Battery ratings |
| coulomb (unit) | Static electricity |
| | How voltage, current, and resistance relate |
| counter | Frequency and Phase Measurement |
| Counter, asynchronous | Asynchronous counters |
| Counter, ring | Decimal versus binary numeration |
| Counter, synchronous | Synchronous counters |
| coupling | Input and output coupling |
| Coupling loop, resonator | Microwave tubes |
| Coupling, signal | Circuit effects |
| covalent bond | Electron activity in chemical reactions |
| CPR | Emergency response |
| CPS (unit) | AC Waveforms |
| CPU | Microprocessors |
| Crest | Measurements of AC magnitude |
| Crest factor | Measurements of AC magnitude |
| Critical temperature, superconductors | Conductor and Insulator Tables |
| Crossover distortion | Tubes versus Semiconductors |
| crossover network | What is a Filter? |
| crowbar | The Silicon-Controlled Rectifier (SCR) |
| CRT | What is a meter? |
| | AC Voltmeters and Ammeters |
| | Display tubes |
| Crumb | Bit groupings |
| crystal | Frequency and Phase Measurement |
| | Crystal Structure |
| CSMA | Network protocols |
| CSMA/BA | Network protocols |
| CSMA/CD | Network protocols |
| CT | Special transformers and applications |
| | Protective relays |
| CUPL | Introduction |
| Current | Conductors, insulators, and electron flow |
| | Voltage and current |
| | How voltage, current, and resistance relate |
| Current divider | Current divider circuits |
| | Current divider |
| Current divider formula | Current divider circuits |
| Current mirror | Current mirrors |
| | 555 Ramp Generator |
| | Current Mirror |
| | JFET Current Regulator |
| current regulator | Current Mirror |
| Current signal | Current signal systems |
| Current signal, 10-50 milliamp | Current signal systems |
| Current signal, 4-20 milliamp | Current signal systems |
| Current sink | The NOT gate |
| | CMOS gate circuitry |
| Current source | Norton's Theorem |
| | Current signal systems |
| | Voltage-to-current signal conversion |
| | Active mode operation |
| | The NOT gate |
| | CMOS gate circuitry |
| Current sourcing vs. sinking | Current mirrors |
| current transfor | AC Voltmeters and Ammeters |
| current transformer | Special transformers and applications |
| | Protective relays |
| Current, alternating | Voltage and current |
| Current, contact "wetting" | Switch contact design |
| current, definition | Ammeter usage |
| Current, direct | Voltage and current |
| current, inrush | Fuses |
| Current, line | Three-Phase Y and Delta Configurations |
| Current, phase | Three-Phase Y and Delta Configurations |
| current, precise definition | Power in electric circuits |
| Current, relay drop-out | Relay construction |
| Current, relay pull-in | Relay construction |
| Current-limiting diode | Constant-current diodes |
| Current-regulating diode | Constant-current diodes |
| Curve, characteristic | Active-mode operation |
| | Active mode operation |
| cutoff frequency | Low-Pass Filters |
| | High-pass filters |
| Cutoff voltage | The transistor as a switch |
| Cutoff, transistor | The transistor as a switch |
| | Active mode operation |
| cycle | AC Waveforms |