Page 45 - The Illustrated Dictionary of Electronics

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30 angle of conduction • anhysteresis

angle of conduction 1. Also called angle of flow. frequency. Compare ANGLE OF LAG. Also see
The number of degrees of an excitation-signal cy- PHASE ANGLE.
cle during which output (drain, collector or plate) angle of radiation 1. The angle, measured with re-
current flows in an amplifier circuit. 2. The num- spect to the horizon, at which the principal lobe of
ber of degrees of any sine wave at which conduc- an electromagnetic wave leaves a transmitting
tion of a device (e.g., a diode) begins. antenna. 2. The angle, measured relative to the
angle of convergence 1. In any graphical repre- horizon, of a receiving or transmitting antenna’s
sentation, the angle formed by any two lines or optimum sensitivity.
plots that come together at a point. 2. The angle angle of reflection The angle, measured relative to
formed by the light paths of two photocells fo- the perpendicular (orthogonal) to a surface, sub-
cused on the same object. tended by a ray leaving the surface after having
angle of declination The angle between the hori- been reflected from it. Compare ANGLE OF INCI-
zon and a descending line. Compare ANGLE OF DENCE.
ELEVATION. angle of refraction The angle, measured relative
angle of deflection In a cathode-ray tube, the an- to the perpendicular (orthogonal) to a boundary
gle between the electron beam at rest and a new between two different media, subtended by a ray
position resulting from deflection. leaving the boundary after having been refracted
angle of departure The angle, relative to the thereat. Compare ANGLE OF INCIDENCE.
horizon, made by the line of propagation of a angle tracking noise Noise in a servo system that
transmitted radio wave. Compare ANGLE OF results in a tracking error.
ARRIVAL. angstrom (Anders J. Angstrom, 1814–1874). A
unit of length used to describe certain extremely
short waves and microscopic dimensions; 1
angstrom equals 10 –4 microns (10 –10 meters).
angular deviation loss The ratio of microphone or
loudspeaker response on the principal axis of re-
sponse to the response at a designated angle from
that axis. Expressed in decibels.
angular difference See PHASE ANGLE.
angular displacement In an ac circuit, the separa-
tion, in degrees, between two waves. See PHASE
ANGLE.
angular frequency The frequency of an ac signal,
expressed in radians per second (rad/sec) and ap-
proximately equal to 6.28f, where f is the fre-
quency in Hertz.
angular length Length, as along the horizontal
axis of an ac wave or along the standing-wave
angle of depression See ANGLE OF DECLINA- pattern on an antenna, expressed as the product
TION. of radians and wavelength.
angle of divergence In a cathode-ray tube, the an- angular-mode keys On a calculator or computer,
gle formed by the spreading of an undeflected the DEG, RAD, and GRAD keys for expressing or
electron beam as it extends from the gun to the converting angles in DEGREES, RADIANS, and
screen. GRADS, respectively.
angle of elevation The angle that an ascending angular phase difference For two sinusoidal
line subtends, with respect to the horizon. Com- waves, the phase difference, expressed in degrees
pare ANGLE OF DECLINATION. or radians.
angle of flow See ANGLE OF CONDUCTION. angular rate In navigation, the rate of bearing
angle of incidence The angle, measured relative to change, expressed in degrees or radians.
the perpendicular (orthogonal) to a surface or angular resolution The ability of a radar to distin-
boundary, subtended by an approaching ray. guish between two targets by angular measure-
Compare ANGLE OF REFLECTION and ANGLE ment.
OF REFRACTION. angus pen recorder An instrument that makes a
angle of lag The phase difference (in degrees or ra- permanent record of the time whenever a channel
dians) whereby one component follows another in is used.
time, both components being of the same fre- anharmonic oscillator An oscillating device in
quency. Compare ANGLE OF LEAD. Also see which the force toward the balance point is not
PHASE ANGLE. linear, with respect to displacement.
angle of lead The phase difference (in degrees or anhysteresis The magnetization of a material by a
radians) whereby one component precedes an- unidirectional field containing an alternating field
other in time, both components being of the same component of gradually decreasing amplitude.