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P

PRECESSION VECTOR

In a gyro, a vector representing the angular change of the spin axis when
torque is applied. The precession vector represents the axis about which precession occurs [15].


PRESTANDARD NAVY SYNCHROS

Synchros that are designed to meet Navy, rather than servicewide, specifications [15].


PREVENTIVE MAINTENANCE

Visual, mechanical, electrical, and electronic checks that are made to
determine whether or not equipment is functioning properly [16].


PRIMARIES

PRIMARIES (OF LIGHT)—The three primary colors of light from which all other colors can be derived. The colors are red, green, and blue [10].


PRIMARY CELL

An electrochemical cell in which the chemical action eats away one of the electrodes, usually the negative electrode [1].


PRIMARY LOOP

In a cooling system, the primary source of cooling for the distilled water [18].

PRIMARY WINDING

The winding of a transformer connected to the electrical source [2].

PRIME MOVER

The source of the turning force applied to the rotor of a generator. This may be an electric motor, a gasoline engine, a steam turbine, and so forth [5].


PRINTED CIRCUIT BOARD

A flat, insulating surface upon which printed wiring and miniaturized
components are connected in a predetermined design and attached to a common base [7] [14].


PRISM

A triangular-shaped glass that refracts and disperses light waves into component wavelengths [10].



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