The Illustrated Dictionary of Electronics by Stan Gibilisco

Author:Stan Gibilisco [Gibilisco, Stan]
Language: tur
Format: epub, pdf
Published: 0101-01-01T00:00:00+00:00

5059F-pJ-385-388 4/10/01 9:06 AM Page 385

J

1. Abbreviation for JOULE. 2. Symbol for JACK

ing outer case or wrapper on a component, such

or CONNECTOR. 3.

Symbol for EMISSIVE

as a capacitor. 3. A shield can or shield box. 4. A POWER.

heat-radiating or water-conducting enclosure

j ( j operator)

The square root of –1; an imaginary

used in cooling a power vacuum tube.

number (usually denoted i in mathematics). As-

jack panel

A (usually metallic) panel in which a

signed to reactance values depicted on the verti-

number of jacks are mounted, usually in some

cal axis of the resistance-reactance (RX) plane in

order or sequence as denoted by labels.

impedance vector diagrams, and whose currents

are 90 degrees out of phase with the current in

the resistive part of an alternating-current cir-

cuit.

jack

A receptacle for a plug. A plug (a male connec-

tor) is inserted into a jack (a female connector) to

complete a circuit or removed from it to break a

circuit.

jack panel

jackscrew

In a two-piece connector, a screw for

mating or separating the halves of the connector.

Jacob’s law

A principle concerning the behavior of

motors. An electric motor develops maximum

power when Ei = 2 Ebk, where Ei is the applied voltage and Ebk is the back voltage.

JAES

Abbreviation for Journal of the Audio Engi-

neering Society.

jaff

Colloquial term for radar jamming that com-

bines electronic and chaff techniques.

jag

Distortion caused by temporary loss of syn-

chronization between the scanner and recorder in

jack

a facsimile system.

jam input

1. A means of setting a logic line to the

jack box

A (usually metallic) box or can used to

desired condition by directly applying the desired

hold, shield, or protect a jack or group of jacks.

high or low voltage. 2. A voltage applied to a logic jacket

1. The outer covering on a cable, as opposed

line to force it high or low.

to the insulation or dielectric separating the indi-

jammer

1. A radio transmitter or station used for

vidual conductors within the cable. 2. An insulat-

the purpose of JAMMING communications be-

Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.