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Power Supplies A to Z : "J"

We've included this handy glossary to help with the terminology & abbreviations relating to power products. Pick a letter below to begin, or download the glossary to refer to it whenever you like.

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Abbreviation for joule.


Abbreviation for Joint Electronic Device Engineering Council.


Abbreviation for Junction Field Effect Transistor. See also Field Effect Transistor.

Joint Electronic Device Engineering Council (JDEC)

A group within the Electronic Industries Association, originally formed in conjunction with NEMA. No longer affiliated with NEMA, the EIA group has retained the JDEC acronym.

Joule (J)

Unit of energy equal to one watt second. Written as 'joule'. Abbreviated to J.

Junction Field Effect Transistor (JFET)

A usually low power semiconductor (although high power SiC JFETs are being investigated)having a conductive channel whose resistance is controlled by the reverse voltage on the gate channel junction. See Field Effect Transistor.

Schematic Symbols for J-FETs

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Download the glossary :

Feel free to download the latest version of our glossary as a PDF file.