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Term
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Description
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| Capacitor |
An electronic component that stores a charge and provides a reserve of power in a circuit. Typically used to smooth variations in a power-supply’s output voltage, and to provide power in the event of brief power failures. |
| Carry Current |
The amount of current a relay’s contacts can safely conduct after the contacts close. |
| CDP |
Acronym for Charging Downstream Port. Refers to a USB port defined in the Battery Charging Specification (BC v1.2) that supports data transfer as well as a minimum of 100mA and a maximum of 1.5A @ 5V DC to connected USB devices. |
| Chassis Ground |
The ground point in a system, typically on a metal chassis, where signals connect to an earth ground. In most cases, a grounded chassis helps shield circuits from EMI and RFI, and provides a safety connection to ground. This type of ground should not carry current. See also: Analog Ground and Digital Ground. |
| Coil |
The wire-wound electromagnetic core of a relay or solenoid. See also: Relay and Solenoid. |
| COM |
1. Abbreviation of "Communication" (e.g., COM Port). 2. Acronym for "Computer on Module", an integrated computing form factor (i.e., COM Express). |
| Common Reference |
A single reference point for one or more signals. |
| Complement |
In logic, an operation in which a logic 1 becomes a logic 0, and vice versa. In binary numbers, the complement of 101100 = 010011. |
| Coulomb |
(Symbol: C) A unit for measuring the electrical charge accumulated over one second of continuously receiving one amp of current (1 C = 1 A * 1 s). Named after Charles-Augustin de Coulomb (1736-1806). See: Amp |
| CPU |
Central Processing Unit - The decision-making part of a computer, usually found within a computer’s microprocessor. |
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