Electronics (Mike Jaroch)


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P

PICO

A prefix adopted by the National Bureau of Standards meaning 10 -12 [1].

PICTORIAL DIAGRAM

A diagram showing actual pictorial sketches of the various parts of an
equipment and the electrical connections between the parts [4].


PIEZOELECTRIC EFFECT

The effect of producing a voltage by placing a stress, either by compression, expansion, or twisting, on a crystal and, conversely, producing a stress in a crystal by applying a voltage to it [1].


PIP

PIP (BLIP)—On a CRT display, a spot of light or a baseline irregularity representing the radar echo [18].

PITCH

A term used to describe the frequency of a sound heard by the human ear [10].

PLANAR TUBE

An electron tube, constructed with parallel electrodes and a ceramic envelope, that is used at uhf frequencies. It is commonly referred to as a lighthouse tube [6].


PLANE OF POLARIZATION

The plane (vertical or horizontal), with respect to the earth, in which the
E field propagates [10].


PLANE WAVEFRONTS

Waves of energy that are flat, parallel planes and are perpendicular to the
direction of propagation [18].


PLANNED-POSITION INDICATOR

A radar display in which range is indicated by the distance of a bright spot or pip from the center of the screen and the bearing is indicated by the radial angle of the spot [18].


PLATE

(1) One of the electrodes in a storage battery [1]. (2) One of the electrodes in a capacitor [2]. (3) The principal electrode to which the electron stream is attracted in an electron tube [6].



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