J

j
A prefix used to indicate an imaginary number. (Operator j)

jack
Socket or connector into which a plug may be inserted.

JFET
Abbreviation for "Junction field effect transistor".

joule
The unit of work and energy.

junction
Contact or connection between two or more wires or cables. The area where the p-type material and n-type material meet in a semiconductor.

junction diode
diode. A semiconductor diode in which the rectifying characteristics occur at a junction between the n-type and p-type semiconductor materials.

K
kilo
Metric prefix for 1000. (103)

kilovolt-ampere
1000 volts at 1 ampere.

kilowatt-hour
1000 watts for 1 hour.

kilowatt-hour meter
A meter used by electric utility companies to measure the amount of electric power used by a customer.

kinetic energy
Energy associated with motion.

Kirchhoff"s current law
The sum of the currents flowing into a point in a circuit is equal to the sum of the currents flowing out of that same point.

Kirchhoff"s voltage law
The algebraic sum of the voltage drops in a closed path circuit is equal to the algebraic sum of the source voltages applied.

knee voltage
The voltage at which a curve joins two relatively straight portions of a characteristic curve. For a PN junction diode, the point in the forward operating region of the characteristic curve where conduction starts to increase rapidly. For a zener diode, the term is often used in reference to the zener voltage rating.

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