electrons spin in one direction than another, the
CONDUCTIVITY-- Ease with which a substance
atom is magnetized.
transmits electricity.
DROOP-- Mode of governor operation normally
CONDUCTOR-- (1) A material with a large number
used only for paralleling with shore power.
of free electrons. (2) A material that easily
Since shore power is an infinite bus (fixed
permits electric current to flow.
frequency, droop mode is necessary to control
the load carried by the generator. If a
C O U L O M B -- A measure of the quantity of
generator is paralleled with shore power and
electricity. One coulomb is equal to 6.28 x 1018
one attempts to operate in isochronous mode
electrons.
instead of droop mode, the generator governor
speed reference can never be satisfied because
COULOMB'S LAW-- Also called the law of electric
the generator frequency is being held constant
charges or the law of electrostatic attraction.
by the infinite bus. If the generator governor
Coulomb's Law states that charged bodies
speed reference is above the shore power
attract or repel each other with a force that is
directly proportional to the product of their
increase beyond capacity (overload) in an effort
individual charges and inversely proportional to
to raise the shore power frequency. If the speed
the square of the distance between them.
reference is below the shore power frequency,
the load will decrease and reverse (reverse
CPR-- Cardio-pulmonary resuscitation.
power) in an effort to lower the shore power
frequency. The resulting overload or reverse
CROSS-SECTIONAL AREA-- The area of a "slice"
power will trip the generator breaker.
of an object. When applied to electrical
conductors it is usually expressed in circular
D R Y C E L L -- An electrical cell in which the
mils.
electrolyte is in the form of a paste.
CURRENT-- The drift of electrons past a reference
E
point. The passage of electrons through a
conductor. Measured in amperes.
EDDY CURRENT-- Induced circulating currents in
a conducting material that are caused by a
D
varying magnetic field.
D A M P I N G -- The process of smoothing out
EDDY CURRENT LOSS-- Losses caused by random
oscillations. In a meter, damping is used to
current flowing in the core of a transformer.
keep the pointer of the meter from overshooting
Power is lost in the form of heat.
the correct reading.
EFFICIENCY-- The ratio of output power to input
D'ARSONVAL METER MOVEMENT-- A name
power, generally expressed as a percentage.
used for the permanent-magnet moving-coil
movement used in most meters.
ELECTRIC CURRENT-- The flow of electrons.
DIELECTRIC FIELD-- The space between around
ELECTRIC PLANT CONTROL CONSOLE
charged bodies in which their influence is felt.
(EPCC)-- Contains the controls and indicators
Also called Electric Field of Force or an
used to remotely operate and monitor the
Electrostatic Field.
generators and the electrical distribution system.
DIRECT CURRENT (dc)-- An electric current that
ELECTRICAL CHARGE-- Symbol
Q, q. Electric
flows in one direction only.
energy stored on or in an object.
The negative
charge is caused by an excess of
electrons; the
DOMAIN THEORY-- A theory of magnetism based
positive charge is caused by a
deficiency of
on the electron-spin principle. Spinning.
electrons.
electrons have a magnetic field. If more
AI-2
