JacketThe enclosure on a water heater, furnace, or boiler.
JitneyPrivately-owned, small or medium-sized vehicle usually operated on a fixed route but not on a fixed schedule.
JoistOne of a series of parallel timber beams used to support floor and ceiling loads, and supported in turn by larger beams, girders, or bearing walls; the…
JouleA metric unit of energy or work; the energy produced by a force of one Newton operating through a distance of one meter; 1 Joule per second equals 1 Watt…
Joule's LawThe rate of heat production by a steady current in any part of an electrical circuit that is proportional to the resistance and to the square of the…
JunctionA region of transition between semiconductor layers, such as a p/n junction, which goes from a region that has a high concentration of acceptors (p-type)…
Junior water rightsWater rights that are more recent than older or more senior rights. See also Senior water rights
Just-in-time orderingA strategy for managing materials used at a project that ensures materials become available as needed to support activities, but are not stockpiled at the…