# What Is Ac And Dc Current Pdf

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Most of the examples dealt with so far, and particularly those utilizing batteries, have constant voltage sources. Once the current is established, it is thus also a constant.

The AC current changes its polarity and magnitude periodically and continuously with respect to time.

However, the two appear to be more recently coming together to exist in harmony. Alternating and reversing direction 60 times per second 50 in Europe , AC current could be converted to different voltages more easily using a transformer. However, in recent years, DC has seen a bit of a renaissance. While both AC and DC current deliver electricity, the way in which that electricity arrives at its end destination differs.

## What's the Difference Between AC & DC Power?

Latest Articles in "Industry News". Alternating current AC is an electric current that periodically reverses its direction, in contrast to direct current DC which only flows in a single direction which cannot change sporadically. Most students of electrical engineering and related subjects begin their studies by learning about direct current DC. This is because most of the digital electronics these students will build will use DC. However, it is important to understand alternating currents AC and its concepts too, because it has many useful properties and use cases. Alternating current green curve.

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The conducting materials have free electrons which move from one atom to another when the potential difference is applied across them. This flow of electrons in a closed circuit is called current. On the basis of the direction of movement of electrons in a closed circuit, the electric current is mainly classified into two types, i. One of the major differences between the alternating and direct current is that in alternating current the polarity and the magnitude of the current changes at the regular interval of time whereas in direct current it remains constants. Some of the differences are explained below in the form of the comparison chart by considering the various factors;. Basis Alternating current Direct current Definition The direction of the current reverse periodically.

## Direct current

DC is the kind of electricity made by a battery with definite positive and negative terminals , or the kind of charge generated by rubbing certain types of materials against each other. Certain sources of electricity most notably, rotary electromechanical generators naturally produce voltages alternating in polarity, reversing positive and negative over time. Whereas the familiar battery symbol is used as a generic symbol for any DC voltage source, the circle with the wavy line inside is the generic symbol for any AC voltage source. One might wonder why anyone would bother with such a thing as AC. It is true that in some cases AC holds no practical advantage over DC.

### Alternating Current (AC) vs. Direct Current (DC)

Electricity flows in two ways: either in an alternating current AC or in a direct current DC. Electricity or "current" is nothing but the movement of electrons through a conductor, like a wire. The difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or "forward. A magnetic field near a wire causes electrons to flow in a single direction along the wire, because they are repelled by the negative side of a magnet and attracted toward the positive side. This is how DC power from a battery was born, primarily attributed to Thomas Edison's work.

Direct current DC is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors , insulators , or even through a vacuum as in electron or ion beams.

In fact, it made life so simple in all circumstances. Initially, power supply consists of a transformer, which later converted into DC with the help of a rectifier. It is designed to produce alternating current. Alternating Current Direct Current No. C The source of availability is Generator and mains. Sinusoidal, Square Trapezoidal, and Triangular. Thank You.

Why do we use AC?? (DC seems simpler??) • AC power is easier to generate. • late 's → the war of the currents. • Edison.

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This is a Current or Voltage which has alternating polarity. It will have both positive and negative value in any one cycle. AC electricity mimics the mathematical.

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