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  1. A vessel designed to bring two or more substances into contact. 2. A heavy-duty relay used to control electric power circuits. Also known as electric contactor.


Related Terms

PHASE-COMPARISON RELAYING

A method of detecting faults in an electric power system in which signals are transmitted from each of two terminals every half cycle so that a continuous signal is received at an intermediate point if there is no fault between the terminals, while a periodic signal is received if there is a fault.

DAYLIGHT CONTROLS

Special devices which automatically control the electric power to the lamp, causing the light to operate during hours of darkness and to be extinguished during daylight hours.

ELECTRIC LOCOMOTIVE

A locomotive operated by electric power picked up from a system of continuous overhead wires, or, sometimes, from a third rail mounted alongside the track.

DIESEL ELECTRIC LOCOMOTIVE

A locomotive with a diesel engine driving an electric generator which supplies electric power to traction motors for propelling the vehicle. Also known as diesel locomotive.

DIRECT ENERGY CONVERSION

Conversion of thermal or chemical energy into electric power by means of direct-power generators.

DIRECT-POWER GENERATOR

Any device which converts thermal or chemical energy into electric power by methods more direct than the conventional thermal cycle.

COMPENSATION PYRHELIOMETER

A pyrheliometer consisting of two identical Manganin strips, one shaded, the other exposed to sunlight; an electrical current is passed through the shaded strip to raise its temperature to that of the exposed strip, and the electric power required to accomplish this is a measure of the solar radiation.

DEMAND FACTOR

The ratio of the maximum demand of a building for electric power to the total connected load. Also known as demand.

DEMAND METER

Any of several types of instruments used to determine a customer's maximum demand for electric power over an appreciable time interval; generally used for billing industrial users.

DIESEL ELECTRIC POWER GENERATION

Electric power generation in which the generator is driven by a diesel engine.

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