دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: see back emf.

n: (emf) 1. the force that drives electrons and thus produces an electric current. 2. the voltage or electric pressure that causes an electric current to flow along a conductor.3. a difference of potential, or electrical, flow through a circuit against a resistance.

abbr: electromotive force.

electromotive force. The force that drives electrons and creates an electric current.

adj: in an AC circuit voltage and current are in phase when they begin, reach a maximum in the same direction, and return to zero at exactly the same time. Two or more alternating emfs of the same frequency are in phase when their polarities and instantaneous values occur at the same time.

n: electromotive force that is developed in a conductor by moving the conductor within a magnetic field or moving the magnetic field in relation to the conductor.

n: the process by which a magnetic field generates a magnetic field in an unmagnetized material or generates an emf in a conductor by virtue of being near the magnetic material or conductor.

n: the number of electrical degrees between corresponding points on the sine wave of two or more emfs or currents of the same frequency, or between current and voltage in a circuit.

n: several alternating emfs of the same frequency and sine wave form. A polyphase generator has two or more circuits in the field windings.

n: the winding of an induction apparatus, such as a transformer, that is connected to the source of power and induces emf in the secondary winding.