J-L

joule: A unit of energy or work that equals 1 watt-second or 0.0002778 watt-hours (1 kilowatt-hour equals 3,600,000 joules).
jumper: A short length of conductor that connects two points in a circuit.
junction box (J box): A box with a blank cover that provides space to connect and branch enclosed conductors.
K- factor: A number determined from the amount of harmonics in the load current that provides a means to derate equipment to carry the extra harmonic load.
K- rated transformer: A transformer specially designed to handle harmonics.
kilo (k): A metric prefix meaning 1000, or 10 ³.
kilohertz: One thousand hertz.
kilovolt (kV): One thousand volts.
kilowatt (kW): One thousand watts, or the number of watts divided by 1000. Kilowatts are real power and are important in sizing UPSs, motor generators, and other power conditioners. See also power factor .
kilowatt-hour (kWh): The basic unit of electric energy that equals 1000 watts of power used for 1 hour. The amount of power the customer uses is measured in kilowatt-hours (kWh). A measurement of power and time used by utilities for billing purposes. For example, a 75-watt light bulb that burns for 10 hours consumes 0.75 kWh (75 watts 10 hours) or 750 watt-hours.
Kirchhoff s laws of electric networks: The sum of the electrical currents flowing to a point in a network equals the sum of the currents flowing away from that point.
kVA (1000 VA): Kilovolt amperes (volts times amperes) divided by 1000; provides the actual...

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