دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

adj: of or pertaining to an instrument that measures a continuous variable that is proportional to another variable over a given range. For example, temperature can be represented or measured as voltage, its analog.

n: the product of volts and amperes in an AC circuit when voltage and current are measured separately. If voltage and current are not in phase, apparent power is greater than true power.

n: the average of all the instantaneous values of current or voltage in one-half a cycle of AC electricity;equal to 0.636 times the maximum value.

n: voltage induced in the armature of a motor by the magnetic field in which it is turning. Also called counter emf. See electromotive force.

n: The voltage when emulsion begins to demulsify under the certain condition. A target used to measure stability of emulsion.

n: 1. the ability to transmit or convey (as heat or electricity). 2. an electricallogging measurement obtained from an induction survey, in which eddy currents produced by an alternating magnetic field induce in a receiver coil a voltage proportionate to the ability of the formation to conduct electricity. See induction log.

n: Measure of the quantity of electricity transferred across unit area per unit potential per unit time. It is the reciprocal of resistivity. Electrolytes may be added to a fluid to alter its conductivity.

n: a device on a diesel engines governor that increases the engines speed by increasing positive voltage going to the actuator and governor. As the engine needs more fuel to go faster, the direct-acting actuator increases positive voltage to make the governor increase the fuel flowing to the fuel injectors. See electrically actuated governor:

n: an electrical device designed to reduce voltage from primary distribution levels, usually 7,200 or 12,400 volts, to utilization voltages of 480, 240, or 120 volts. See power transfornlet:

n: the value of an AC current or voltage that produces the same heating effect as a direct current of the same amount;equal to 0.707 times the maximum value. Electrical measuring devices read effective values unless otherwise indicated. Also called RMS value.

n: a meter that measures voltage directly, rather than in terms of its relation to current.