(1) System which has two equal but opposite electric charges or magnetic poles separated by a small distance. (2) Molecule with the centers of positive and negative charge separated. (3) Electrical set of poles with a switch, which can turn on two electrical lines simultaneously.
Dipping
Immersing in liquid.
Direct access
The ability of an electric power consumer to purchase electricity from a supplier of their choice without being physically inhibited by the owner of the electric distribution and transmission system to which the consumer is connected to.
Direct beam radiation
Solar radiation that arrives in a straight line from the sun.
Direct capitalization
A capitalization method, which divides a property's first year net operating income by an estimated general capitalization rate to develop a total property estimate. If an income property produces a first year net operating income of $30,000 and the market indicates a general capitalization rate of 10% for comparable properties, the direct capitalization estimate of the value of the total property would be ($30,000/.10) or $300,000.
Direct costs
Costs in erecting a new building involved with either site preparation or building construction, including fixtures, in contrast to indirect costs which include building permits, land survey, and overhead costs such as insurance and payroll.
Direct current (dc)
Electrical supply in which the polarity of the two wires does not change.
Direct drive
With a direct drive tool, all power from the motor is transferred directly to the output shaft.
Direct expansion (refrigeration)
Any system that, in operation between an environment where heat is absorbed (heat source), and an environment into which unwanted heat is directed (heat sink) at two different temperatures, is able to absorb heat from the heat source at the lower temperature and reject heat to the heat sink at the higher temperature. The cooling effect is obtained directly from a fluid called a refrigerant that absorbs heat at a low temperature and pressure, and transfers heat at a higher temperature and higher pressure.
Direct expansion cooling system evaporator
Heat exchanger, which cools air directly using a refrigerant, which is expanded into the evaporator coil. The refrigerant is cooled by the expansion and air passage over the outside of the coil is cooled by the heat transfer through the coil.
