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Glossary of Terms

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TermDefinition
jackA connecting device into which a plug can be inserted to make circuit connections.
Jacket1.) A material covering over a wire or cable assembly. 2.) Outer covering of a dual-wall heat-shrinkable tubing.
jackscrew(connector/accessory) A mechanical fastening device (one or two per connector) used to draw mating connectors together and to separate them. Includes a threaded screw on one connector that engages a threaded bushing on the mating connector.
JAN specificationJoint Army-Navy specification.
jitterShort-term variation of pulses from their ideal position in time.
Jones blockJones is the name of the originator of barrier blocks. The term "Jones block" is sometimes erroneously used to describe terminal strips and barrier blocks in general.
JouleA unit of energy or work, equal to one watt of power applied for one second. In more fundamental units, a joule is defined as the work required to move an object one meter while applying a force of one newton (N), where a newton is the force required to accelerate a one kilogram mass at one meter per square second.
jumper(1) A direct electrical connection, which is not a portion of the conductive pattern, between two points on a printed circuit. (2) Usually unjacketed twisted pair wire used to make a cross connection.
JunctionThe plane in a semiconductor device where two layers that have opposing-polarity dopants physically meet.
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