دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an energy loss in an electric circuit caused by the resistance in ohms of the copper to the flow of current. Equal to the current squared times the resistance in ohms. Also called copper loss.

n: (Z) 1. the total resistance a circuit has to the flow of electricity. 2. the sum of resistance and reactance in an AC circuit. Measured in ohms.

total opposition (resistance, capacitance and inductance),expressed in Ohms, to the flow of current.

n: an instrument for measuring large amounts of resistance in a circuit or insulation. Its name comes from Mega Ohmmeter, a proprietary trade name.

n: unit of conductivity. Compare ohm. mica n: a silicate mineral characterised by sheet cleavage;i.e.. it separates into thin sheets. Biotite is ferromagnesian black mica. and muscovite is potassic white mica. Sometimes mica is used as a lost circulation material in drilling.

n: (Ω) a unit for measuring electrical resistance. One ohm is equal to the resistance through which a current of 1 ampere will flow when a potential difference of 1 volt exists across a circuit.

electrical unit of resistance. One ohm is the the resistance through which a potential of one volt will maintain a current of one ampere.

n: a unit for measuring electrical resistance. If a container with sides of 1 metre each is filled with a solution and a resistance of 1 ohm is measured when a current is passed through the container from one face to the opposite face, the resistivity of the unit volume is 1 ohmmeter.

E=IR, I=E/R, or R=E/I, the current I" in a circuit is directly proportional to the voltage "E", and inversely proportional to the resistance "R".

n: the electrical resistance offered to the passage of current;the opposite of conductivity.

n: the electrical resistance offered to the passage of a current, expressed in ohm-meter;the reciprocal of conductivity. Fresh-water muds are usually characterized by high resistivity, salt-water muds by a low resistivity.

measurement of a substance (or rock) to resist the flow of electric charge. Opposite of Conductance.