"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
Previous section of "A" terms and definitions
ATTENUATION. The decrease in magnitude of a signal as it
travels through any transmitting medium, such as a cable or
circuitry. The ability of a filter circuit to reduce the amplitude of unwanted frequencies to a level below that of the desired output frequency. More detail on 24AWG twisted pair copper wire attenuation
[Resistor Chip Attenuator Manufacturers, RF Attenuator Manufacturers]
L-Pad Attenuator Circuit
ATTENUATOR PAD. A component inserted into a transmission path to introduce transmission loss.
ATTRACTION. The force that tends to make two objects approach each other. Attraction exists between two unlike magnetic poles (north and south) or between two unlike static charges.
AUDIO. Sound between the range of 15 hertz (15 Hz) and 20 kilohertz (20 kHz).
| AUDIO AMPLIFIER. An amplifier designed to amplify frequencies between 15 hertz (15 Hz) and 20 kilohertz (20 kHz). The transistor Q1 is the amplifier in the circuit to the right. |  Audio Amplifier |
AUDIO-FREQUENCY-TONE SHIFT. A system that uses amplitude modulation to change dc mark and space impulses into audio impulses.
AUTOMATIC GAIN CONTROL. A circuit used to limit variations in the output signal strength of a receiver.
| AUTO-TRANSFORMER. A transformer with only one winding. The secondary side [same winding] has two or more fixed taps or a movable tap and a common point with the primary. |  Autotransformer |
AVALANCHE EFFECT. A reverse breakdown effect in diodes that occurs at reverse voltages beyond 5 volts. The released electrons are accelerated by the electric field, which results in a release of more electrons in a chain or "avalanche" effect. Zener Diode Definitions
AVERAGE POWER. The peak power value averaged over the pulse-repetition time. Output power of a transmitter as measured from the start of one pulse to the start of the next pulse.
AVERAGE SEEK TIME. For Hard Disk Drives [HDD] the average seek time is the amount of time it takes for a head to seek out the specified address, which is calculated over a large number of random seeks.
AVERAGE VALUE (OF AC). The average of all the instantaneous values of one-half cycle of alternating current.
AXIAL LEAD. An electrical component that has its terminals [leads] protruding out two sides of the component body, along the devices axis. A through-hole component.
AXIS. A straight line passing through an object to denote its center.
AZIMUTH. Angular measurement in the horizontal plane in a clockwise direction.
