Difference Between Ac And Dc Voltage Pdf

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difference between ac and dc voltage pdf

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However, the two appear to be more recently coming together to exist in harmony.

The AC current changes its polarity and magnitude periodically and continuously with respect to time. The Ac current can be produced with a device named alternator that produces the alternating current. Suppose a piston is inserted inside a pipe and connected with a rotating rod as in the pin pic below. Here the piston has two strokes one towards upward and the other towards backward on the upward stroke, the water moves in a clockwise direction and the backward direction the water displaces in an anticlockwise direction so in this way water direction changes its direction periodically with oscillation of the piston.

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

The major difference between the AC and DC voltage is that in AC voltage the polarity of the wave changes with the time whereas the polarity of the DC voltage always remains same. The other differences between the AC and DC voltage are shown below in the comparison chart. The voltage which causes the alternating current is known as the AC voltage. The alternating current induces in the coil when the current carrying conductor rotates in the magnetic field. The conductor when rotates cuts the magnetic flux and the variation of the flux induces the alternating voltage in the conductor.

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. AC generators gradually replaced Edison's DC battery system because AC is safer to transfer over the longer city distances and can provide more power.

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

Latest Articles in "Industry News". Electricity comes in two forms—alternating current AC and direct current DC. Both are essential to enable the functioning of our electronics, but do you know the difference between the two and what they apply to? Alternating current AC power is the standard electricity that comes out of power outlets and is defined as a flow of charge that exhibits a periodic change in direction. AC 's current flow changes between positive and negative because of electrons—electrical currents come from the flow of these electrons, which can move in either a positive upward or negative downward direction. This is known as the sinusoidal AC wave, and this wave is caused when alternators at power plants create AC power.

Direct current

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. Direct current DC is the flow of electric charge in only one direction.

One looks like a straight line, the other a wave; together, they power your laptop…. Alternating current AC and direct current DC are notable for inspiring the name of an iconic metal band, but they also happen to sit right at the center of the modern world as we know it. AC and DC are different types of voltage or current used for the conduction and transmission of electrical energy.


  1. Flordelis A. 04.05.2021 at 14:57

    The power factor for AC voltage lies between 0 to 1. And the power factor of the DC voltages always remains 1. The polarity of the AC voltage always varies with time, and the polarity of the DC voltage always remain constant. The AC voltage is unidirectional, and the DC voltage is bidirectional.