alternating current

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current

 [kur´ent]
1. something that flows.
2. specifically, electricity transmitted through a circuit.
alternating current a current that periodically flows in opposite directions; its amplitude fluctuates as a sine wave.
convection current a current caused by movement by convection of warmer fluid into an area of cooler fluid.
direct current a current that flows in one direction only; when modeled as a wave, its amplitude is constant. When used medically it is called galvanic current. This current has distinct and important polarity and marked secondary chemical effects.
galvanic current a steady direct current.
current of injury an electric current that flows between injured myocardium and normal myocardium, because such cells have a reduced membrane potential; it may be either diastolic or systolic.
current of injury, diastolic the current that flows from injured to noninjured tissue during electrical diastole.
current of injury, systolic the current that flows from healthy tissue to injured tissue during electrical systole.
inwardly rectifying current current that rectifies so that it passes more easily towards the interior of a cell.
leakage current the electrical current that exists in the parts or metal case of electrical equipment.
outwardly rectifying current current that rectifies so that it passes more easily towards the exterior of a cell.
potassium rectifying c's transmembrane currents that rectify inwardly or outwardly to make adjustments in cellular functions; they are mainly responsible for the repolarization phase of the action potential. There are at least six mechanisms by which potassium ions move across cardiac cell membranes in the role of rectifier.

al·ter·nat·ing cur·rent (AC),

a current that flows first in one direction then in the other, for example, 60-cycle current.

alternating current

An MRI term for a continuously changing flow of electrons that alternates its polarity at a periodic rate. In the US, the current changes at a frequency of 60 Hz.

al·ter·nat·ing cur·rent

(AC, ac, a.c.) (awl'tĕr-nāt-ing kŭr'rĕnt)
Electric current that reverses direction (positive-negative polarity) many times each second (with each rotation of the armature of the dynamo generating the current).

al·ter·nat·ing cur·rent

(AC, a.c.) (awl'tĕr-nāt-ing kŭr'rĕnt)
Electric current that reverses direction (positive-negative polarity) many times each second (with each rotation of the armature of the dynamo generating the current).
References in periodicals archive ?
Figure 5 showed that, at a fixed AC current, the AC losses only slightly increased with the increase of the frequency.
Stationary-frame based PI controllers in [5] represent the basic linear structure, used in both analog and digital implementations of linear AC current controllers.
This same data, when coupled with soil resistance information, will also help identify areas of elevated AC current density with a direct correlation to the potential for AC-related corrosion.
Therefore, we by designing a new topology of current source circuit, could achieving to new AC current source which prepares higher output impedance in compared with other AC current sources; also in new design, we can obtain higher output current swing in compared with other current sources.
Isolating signal conditioning modules are available for DC current and voltage, RTD, thermocouple, potentiometer, strain gauge, AC current, voltage and frequency signals.
The 961EN unit accepts 0-1mA, 0-20mA, or 4-20mA signals; it can also measure 0-20A AC using the optional AC current sensor.
Cameras can be battery powered or operate on AC current. 501
Once the event is over, the switch can be reset to resume AC current and surge protection.
Most solenoid valves now in operation are powered by AC current, primarily because AC voltages are more readily available.
They operate on 120V AC current and 90-psi shop air.
A transmitter electrifies two coaxial cables (transmitter dipole) with an AC current. Current is thus coupled to the earth through the capacitance of the cable.
The loggers detailed will measure and record temperature, relative humidity, AC current, pressure, process signals and pulses.