BATTERY --Two or more primary or
series to start the motor. The values of
and
R are such that the main-winding and starting-
secondary cells connected together electrically.
winding currents are nearly 90 degrees apart, and
The term does not apply to a single cell. A device
the starting torque is produced as in a two-phase
for converting chemical energy into electrical
motor.
energy.
CARDIOPULMONARY RESUSCITATION
BATTERY CAPACITY --The amount of
Procedure designed to restore breathing after
energy available from a battery. Battery capacity
cardiac arrest. Includes clearing air passages to
is expressed in ampere-hours.
lungs and heart massage.
BIAS --In vacuum tubes, the difference of
CELL --A single unit that transforms chemi-
potential between the control grid and the
cal energy into electrical energy. Batteries are
cathode; in transistors, the difference of potential
made up of cells.
between the base and emitter and between the base
and collector; in magnetic amplifiers, the level of
CHOKE COIL --A coil of low ohmic
flux density in the core under no-signal conditions.
resistance and high impedance to alternating
current.
BLOCK DIAGRAM --A diagram in which
the major components of an equipment or a
CIRCUIT --The complete path of an electric
system are represented by squares, rectangles, or
current.
other geometric figures, and the normal order of
progression of a signal or current flow is
CIRCUIT BREAKER --An electromagnetic
represented by lines.
or thermal device that opens a circuit when the
current in the circuit exceeds a predetermined
BRIDGE CIRCUIT --The electrical bridge
amount. Circuit breakers can be reset.
circuit is a term referring to any one of a variety
CIRCULAR MlL --An area equal to that of
of electric circuit networks, one branch of which
a circle with a diameter of 0.001 inch. It is used
(the bridge proper) connects two points of equal
for measuring the cross section of wires.
potential; therefore, it carries no current when the
circuit is properly adjusted or balanced.
COAXIAL CABLE --A transmission line
consisting of two conductors concentric with and
BRUSH --The conducting material, usually a
insulated from each other.
block of carbon, bearing against the commutator
or slip rings through which the current flows in
COMMUTATION --The act of a commutator
or out.
in converting generator output from an ac voltage
to a dc voltage.
BUS BAR --A primary power distribution
point connected to the main power source.
COMMUTATOR --The copper segments on
the armature of a motor or generator. It is
CABLE HARNESS --A group of wires or
cylindrical in shape and is used to pass power into
ribbons of wiring used to interconnect electronic
or from the brushes. A mechanical device that
systems and subsystems.
reverses armature connections in motors and
generators at the proper instant so that current
CAGING (GYRO) --The act of holding a gyro
continues to flow in only one direction. In effect,
so that it cannot precess or change its attitude with
the commutator changes ac to dc.
respect to the body containing it.
COMPARATOR --A circuit that compares
CAPACITOR --Two electrodes or sets of
two signals or values, and indicates agreement or
electrodes in the form of plates, separated from
variance between them.
each other by an insulating material called the
COMPENSATING WINDINGS --Windings
dielectric.
embedded in slots in pole pieces, connected in
series with the armature, whose magnetic field
CAPACITOR-START MOTOR --A type of
opposes the armature field and cancels armature
single-phase, ac induction motor in which a
reaction.
starting winding and a capacitor are placed in
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