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An alternating current (AC) is an electric current whose direction reverses cyclically, as opposed to direct current, whose direction remains constant. The usual waveform of an AC power circuit is a sine wave, as this results in the most efficient transmission of energy.

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Q: What is direct and alternating voltage?
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What is term used when an Alternating current acts like a direct current?

Perhaps you are asking how the voltage of alternating current is measured, to be equivalent to the voltage of a direct current system. Alternating current and direct current have distinct properties. With direct current, voltage is at a constant polarity, and a direct current voltage source will maintain a uniform, constant voltage level. Alternating current reverses polarity at a given frequency and therefore it's voltage continuously varies from a positive peak voltage level, through zero, to a negative peak voltage level, repeating this cycle continuously. For this reason, voltage of an alternating current system, is measured in root-mean-square (rms), which is a voltage, which when multiplied by the current in amperes, calculates power which is equivalent to that of direct current of the same voltage and current values. With a typical sinusoidal waveform, the peak voltage of alternating current is divided by the square root of 2 to determine the rms voltage. The 120 volts output in the wall outlet in our home is actually about 170 peak volts.


What are the kinds of voltage?

Alternating current - AC, and direct current - DC.


In electric terms what do the abbreviations AC and DC mean?

Its Alternate Current and Direct Current. I believe Angus Young got the idea for the band name when he say AC/DC on the bottom of his sisters sewing kit. Electric current can be direct current (DC) or alternating current (AC). Direct current such as the power from dry cells is characterized by a uniform direction of flow and amount (voltage) of electricity.


What is the meaning of DC Voltage?

D.C. stands for direct current. A.C. is alternating current.


Would you expect to find an alternating or direct current in the secondary coil of a transformer?

An Alternating Voltage is induced in the secondary winding. When connected to an external load, you will have an alternating current.


What is the Difference Between VAC and DC Current?

VAC is voltage of alternating current signalDC current is amperage of a direct current signalAnswerYour question contradicts itself, as the symbol, V,represents voltage, not current.However, V a.c., represents an alternating voltage -one in which the direction in which the voltage is acting continuously reverses itself. Vd.c. represents a direct voltage, in which the voltage continuously acts in the same direction.


What does ac stand for the mains voltage supplied in the UK?

AC stands for Alternating Current and DC stands for Direct Current.


How does ac dc power supplies work?

The mains to the house is an alternating current and this high voltage is stepped down using a transformer. The low voltage secondary alternating current is converted to direct current using 4 diodes wired as a bridge rectifier. The 'lumpy' direct current is smoothed using an electrolytic capacitor to smooth the resulting dc. It may need to be voltage regulated if the circuits it feeds are voltage sensitive.


What is rms value in ac system?

The r.m.s. value of an alternating current or voltage is the value of direct current or voltage which produces the same heating effect.


What is the difference between a transformer and a rectifer?

A transformer is used to change the value of a voltage applied to the transformer's primary winding to a different voltage value taken from the transformers secondary winding. A rectifier is used to change an alternating current value to a direct current value.


Is vac and watt the same?

No, VAC is in direct reference to Voltage Alternating Current. This is much different than VDC which is in direct reference to Voltage Direct Current. The term volts refers to all voltages and does not specify what type it is.


What type of current is used in your home alternating or direct?

In North America the electrical system is alternating current at a frequency of 60 Hertz. Europe and the UK use alternating current at a frequency of 50 Hertz. Direct current systems are obsolete because of the inability to transmit the voltage over long distances.