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Topic: AC current

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	AC Current Probe
		I needed several current probes when designing the deflection circuits and high voltage supply for a computer display monitor, and the lab in which I was consulting only had one current probe, which I shared with the other four engineers on the project.
		The current induced in the secondary is inversely proportional to the number of turns in the secondary.
		The secondary current causes a voltage drop across the 2.7 Ohm sense resistor, and this voltage is further divided by the 1K potentiometer.
	cappels.org /dproj/aciprobe/ACCurrentProbe.html (1435 words)

	Alternating current - Wikipedia, the free encyclopedia
		AC systems overcame the limitations of the direct current system used by Thomas Edison to distribute electricity.
		Since the current tends to flow in the periphery of conductors, the effective cross-section of the conductor is reduced.
		The current flowing on the inner conductor is equal and opposite to the current flowing on the inner surface of the outer tube.
	en.wikipedia.org /wiki/Alternating_current (2317 words)

	AC Current Transformers or Current Sensors
		A current transformer is a type of transformer that is usually placed in the main circuit to step down a high current circuit to drive a low current device, usually a low current meter or resistor.
		The primary winding current is essentially made up of three components; the loss current that supplies iron and copper loss, the magnetizing current that establishes the flux in the core and the load current.
		If high accuracy current transformer is needed, the loss and magnetizing current need to be kept as low as possible so that the secondary current will truly reflect the primary current which is also the current to be measured or sensed.
	www.toroid.com /knowledge_base/AC_current_transformers.htm (937 words)

	AC Power and Current Measurement Selection Guide
		AC current sensors can be loop powered or self-powered and can be split-core (to install CT can clamp around wire) or solid-core (to install wire must pass through CT).
		Depending upon the number of phases, one to three AC current sensors are placed around the current carrying conductor(s) and a sensing lead(s) is attached to the voltage source.
		One to three AC current sensors are placed around the current carrying conductors and voltage sensing leads are attached to the voltage source.
	www.logicbeach.com /ac-power-current-measurement-selection-guide.html (843 words)

	Alternating Current (ac). (Site not responding. Last check: 2007-10-11)
		We will consider the current at the bottom end of the wire labelled B. The loop of wire is rotated in a counter clockwise direction so initialy the end B is moving parallel to the magnetic field.
		At the point B the e.m.f produces a current that points out of the screen (at T the e.m.f produces a current pointing into the screen, since both ends of the loop are moving in opposite directions).
		The current is again its strongest when the loop is parallel to the field and the rotation is perpendicular.
	www.sunblock99.org.uk /sb99/people/DMackay/ac.html (929 words)

	Directory:Sully Direct Current - PESWiki (Site not responding. Last check: 2007-10-11)
		The multi-directional electric currents have the effect of accelerating processes that rely on interaction between a current and the medium that carries the current, and of eliminating asymmetries that can lead to scaling or premature wear in batteries and other electrolytic systems.
		However, unlike conventional DC and AC currents, the currents generated by the method and apparatus of the invention move or rotate.
		Multi-directional currents are generated in a medium by cyclically reversing the direction of a conventional current applied to at least one of at least two electrodes so that an electromotive force (EMF) pulse travels from side of the electrode to the other, changing the direction of current in the medium.
	peswiki.com /index.php/Directory:Sully_Direct_Current (2779 words)

	ALTERNATING CURRENT
		The time required for the current to rise to its maximum value is determined by the ratio of inductance, in henrys, to resistance, in ohms.
		Current is delayed depending on the mount of inductance.
		The phase relationship between current and voltage are opposite to the phase relationship of an inductive circuit.
	www.geocities.com /vijayakumar777/electricity/electricity.html (3112 words)

	Hall-Effect Current Clamps, AC Current Transformers, Hall Effect Sensors - AYA Instruments
		The specifications of an AC clamp includes the current range that it is designed for, the output that it delivers at full scale, the input-output current ratio, the size of the window opening, the voltage rating, the accuracy and other parameters.
		The output current of the Hall-Effect sensors is proportional to the flux density of the magnetic field.
		Their current measuring range is specified to indicate the full scale DC current and the full scale AC current in Peak-to-Peak values.
	www.ayainstruments.com /applications3.html (495 words)

	Alternating Current (AC) Transformers - Succeed in Physical Science
		A major advantage of alternating current (AC) electricity over direct current (DC) is the fact that the potential energy can be readily changed from one voltage to another through the use of a transformer.
		The greater the current through the wire (or the higher the voltage) the greater the strength of the electromagnet.
		An adapter is a transformer that changes the 110V AC house current to 12V DC or 9V DC that is used by the device.
	www.school-for-champions.com /science/actransformers.htm (1429 words)

	Alternating Current (AC) Electricity - Succeed in Physical Science
		Alternating current or AC electricity is the type of electricity commonly used in homes and businesses throughout the world.
		While the flow of electrons through a wire in direct current (DC) electricity is continuous in one direction, the current in AC electricity alternates in direction.
		AC electricity alternates back-and-forth in direction 50 or 60 times per second, according to the electrical system in the country.
	www.school-for-champions.com /science/ac.htm (1087 words)

	AC Fundamentals
		AC signals are generated by (a) an AC generator or by (b) electronic function generators.
		The RMS value of a sine wave for voltage or current is equivalent to the DC voltage or current that would produce the same amount of heat in a resistance circuit.
		AC voltage: the input couple may be set to DC (which does not filter out the DC signal) or to AC (which does filter out any DC signals).
	www.hcc.hawaii.edu /~sdunan/cent112/notes/05ACFundamentals (1527 words)

	Lessons In Electric Circuits -- Volume II (AC) - Chapter 1
		The AC voltage induced in the unpowered (“secondary”) coil is equal to the AC voltage across the powered (“primary”) coil multiplied by the ratio of secondary coil turns to primary coil turns.
		Of course, direct current may be interrupted (pulsed) through the primary winding of a transformer to create a changing magnetic field (as is done in automotive ignition systems to produce high-voltage spark plug power from a low-voltage DC battery), but pulsed DC is not that different from AC.
		Unfortunately, an AC measurement based on work performed by a waveform is not the same as that waveform's “average” value, because the power dissipated by a given load (work performed per unit time) is not directly proportional to the magnitude of either the voltage or current impressed upon it.
	www.ibiblio.org /obp/electricCircuits/AC/AC_1.html (7035 words)

	Applications - AC Current Transformers: Branom Instrument Company
		To reduce danger to personnel, and to reduce the heat generated by high AC current, toroidal AC Current Transformers (also called transducers) are inexpensive, common solutions.
		All Current Transformer Secondaries must be short-circuited when not in use, and the S ampere terminal of the meter-receiver connection must connect to a secondary "BEFORE" the short is removed from that secondary.
		The ratio of the current tranformer can be modified by altering the number of secondary turns by forward or backwinding the secondary lead through the window of the current tranformer.
	www.branom.com /literature/actransformer.html (1312 words)

	AC Circuits
		, the amplitude of the ac current through the resistor and the ac voltage across the resistor.
		, the amplitude of the ac current through the inductor and the ac voltage across the inductor.
		, the amplitude of the ac current "through" the capacitor and the ac voltage across the capacitor.
	www.physics.sjsu.edu /becker/physics51/ac_circuits.htm (263 words)

	War of Currents - Wikipedia, the free encyclopedia
		During the initial years of electricity distribution, Edison's direct current was the standard for the United States and Edison was not disposed to lose all his patent royalties.
		When Tesla introduced a system for alternating current generators, transformers, motors, wires, and lights in November and December of 1887, it became clear that AC was the future of electric power distribution, although DC distribution was used in downtown metropolitan areas for decades thereafter.
		The advantage of AC for distributing power over a distance is due to the ease of changing voltages with a transformer.
	en.wikipedia.org /wiki/War_of_Currents (2144 words)

	Furman Sound - FAQ - AC Current Draw (Site not responding. Last check: 2007-10-11)
		When an AC line or an AC power conditioner is rated for a given current input or output, the number refers to the maximum R.M.S. current draw that can be handled before the circuits breaker of fuse engages and disconnects the power source or shuts down the power conditioner.
		As they are concerned with the effects of current compression, they will typically as for an over sized, over rated AC supply, because they know that a 20 amp circuit will have less resistance than a 15 amp circuit of the same length.
		Current compression occurs when a power amplifier attempts to draw power for fast transient signals that exceed the short term capabilities of the unit s power supply.
	www.furmansound.com /products/tech_corner/faq_ac_current.php (811 words)

	NDT Encyclopedia - MPI: Alternating Current (AC)
		Alternating current is current that reverses its direction of flow at regular intervals.
		This rectified alternating current for which the rectifier is so connected that the reverse half of the cycle is “turned around”, and fed into the circuit flowing in the same direction as the first half of the cycle.
		Commercial electricity is commonly transmitted as three single-phase currents, that is, three separate currents following separate sine curves, each at 60 cycles (or other frequency) per second, but with the peaks of their individual curves one-third of a cycle apart.
	www.ndt.net /article/az/mpi/alternating_current.htm (525 words)

	5th Tutorial on PSpice
		The AC source is assumed to be a cosine waveform at a specified phase angle.
		Similarly, the polarity of the AC current source is determined as if the current were a cosine function of ωt at t = 0.
		The.PRINT AC command tells PSpice to report on the voltage magnitude and phase angle at node 3, and the current magnitude and phase angle for the current through resistor Rm and the current magnitude and phase angle through capacitor Cx.
	dave.uta.edu /dillon/pspice/pspice05.htm (1050 words)

	What is alternating current? - a definition from Whatis.com - see also: AC
		In electricity, alternating current (AC) occurs when charge carriers in a conductor or semiconductor periodically reverse their direction of movement.
		Household utility current in most countries is AC with a frequency of 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz.
		An example of sine-wave AC is common household utility current (in the ideal case).
	whatis.techtarget.com /definition/0,,sid9_gci213754,00.html (361 words)

	AC Current Sensors - DC Current Sensors
		Electrical current sensors are used to measure current.
		Electrical current sensors can measure either AC or DC current and can be either open or closed loop sensors.
		Ratings for current overload can be important, as they will determine the amount over the standard sensing level that the sensors can handle.
	www.eeurd.com /pages/ac_current_sensors.htm (418 words)

	Sunelco:Renewable solar photovoltaic power, pump, wind energy design
		The difference in AC current and DC current is that rather than being delivered up in a smooth, continuous flow like DC electricity, AC current is switched on and off at a high rate of speed usually 50 to 60 times per second.
		The 50 or 60 pulses per second (called hertz or Hz) of AC electricity are alternately sent down the Hot and Neutral wires to the load.
		No discussion of AC electricity in relation to renewable energy is complete without mentioning that there are two basic types of inverters commonly in use today.
	www.sunelco.com /altcurrent.aspx (727 words)

	DIN Rail Mount AC Voltage/Current Signal Conditioners, Self-Powered Design
		The DRA-ACT-SI AND DRA- ACT-SV Series are self-powered ac current and ac voltage input DIN rail mount signal conditioners that use the measured input to produce an accurate and linear output current.
		The output current from all of these self-powered models always starts at 0 mA since these units are powered from the measured signal.
		Therefore, when the ac current or voltage input is zero, the output is zero.
	www.omega.com /pptst/DRA-ACT-S.html (285 words)

	INSD: Computer Room AC Electrical Power Management
		Second, many devices have a significant "in-rush" current at power-up, which is not indicated on the power label and can easily exceed the rating of a circuit breaker, especially several devices are powered up at once.
		If you want to really document and manage your ac current, you must also document the in-rush current, which is the current drawn during the first few moments after a device is powered up.
		The meter measures, and holds in the display, the maximum current measured (in-rush current may be too quick to see in the normal display mode).
	www.llnl.gov /icc/netdiv/power.html (908 words)

	True AC RMS Meter
		It is suited for AC applications where there is considerable distortion of current waveforms from nonlinear loading.
		The input is AC coupled to read only the AC component, such as ripple on a power supply.
		Successful synchronization of two motor generators requires that the voltage outputs of the generators be close to each other, that the two frequencies be identical, and that the voltage waveshapes be in phase.
	www.micronmeters.com /meters/mm50/true-ac-rms.htm (997 words)

	AC Current Monitors
		The secondary wires from an external 5A CT are passed through the on-board CT, power is then applied to the supply terminals and the 20PC ammeter.
		AC powered models are totally self contained and operate from 85 to 264V AC with no external components or power supplies.
		All models feature a full 2000V isolation between the DC supply and the AC currents being measured.
	www.hoytmeter.com /20accur/ac-current-monitors.html (195 words)

	Lessons In Electric Circuits -- Volume VI (Experiments) - Chapter 4
		We use the term "impedance" to describe the headphone's opposition to current because it is primarily AC signals that headphones are normally subjected to, not DC.
		As with the low-voltage AC power supply experiment, I recommend building this detector in a permanent fashion (mounting all components inside of a box, and providing nice test lead wires) so it can be easily used in the future.
		The AC voltages produced by a musical keyboard are too low to cause damage to your computer through the sound card, but other voltage sources might be hazardous to your computer's health.
	www.ibiblio.org /obp/electricCircuits/Exper/EXP_4.html (8428 words)

	AC Current Source (SimPowerSystems)
		The AC Current Source block implements an ideal AC current source.
		The positive current direction is indicated by the arrow in the block icon.
		The peak amplitude of the generated current source, in amperes (A).
	www.weizmann.ac.il /matlab/toolbox/powersys/accurrentsource.html (157 words)

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