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Candlepower (or
Candela)
Basic unit for measuring luminous
intensity from a light source in a given direction.
Capacitor
A device that stores electrical charge,
using a positively charged surface and a negatively charged surface with a
gap between them. The Leyden jar, used by early electrical experimenters
(including Benjamin Franklin) was a form of capacitor. A smaller kind of
capacitor is often used in electrical circuits.
Cell
A single device which converts chemical
energy into electrical current. Sometimes referred to as a battery.
Circuit Breaker
A device designed to open and close a
circuit by non-automatic means and to open the circuit automatically on a
pre-determined overcurrent without damage to itself when applied within it's
rating.
Coefficient of
Utilization
The amount of light (lumens)
delivered in a workplace as a percent of the rated lumens of the lamp.
Cold Cathode Lamp
An electric-discharge lamp whose mode of operation is
that of a glow discharge (Neon Lights).
Common Mode (CM)
The term refers to electrical interference which is
measurable as a ground referenced signal. In true common mode a signal is
common to both the current carrying conductors.
Common Node Noise
An undesirable voltage which appears between the power
conductors and ground.
Conductance
The ability of a material to conduct or
carry an electric current. It is the reciprocal of the resistance of the
material, and is expressed in mhos.
Conductivity
The ease with which a substance transmits
electricity.
Conductor
A Bare conductor having no
covering or electrical insulation whatsoever.
An insulated conductor encased within material of composition and
thickness that is recognized by the National Electrical Code (NEC) as
electrical insulation.
Conduit
A tubular raceway for data or power cables. Metallic
conduit is common, although non-metallic forms may also be used. A conduit
may also be a path or duct and need to be tubular.
Continuity
The state of being whole, unbroken.
Continuous Load
A load where the maximum current is expected to
continue for three or more hours. Rating of the branch circuit protection
device shall not be less tan 125% of the continuous load.
Current
The movement of electrons through a conductor. Measured
in amperes and its symbol is "I".
Current
Transformer- (or CT) A transformer used in instrumentation to
assist in measuring current. It utilizes the strength of the magnetic field
around the conductor to form an induced current that can then be applied
across a resistance to form a proportional voltage.
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