AC Circuit

As we know any balanced Star connected system can be completely replaced by an equivalent Delta connected system. This means that a three phase Star connected balanced system having line voltage VL and line current IL can be replaced by an equivalent Delta connected system having phase voltage VL and ...
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Magnetic Circuit is defined as the path followed by a Magnetic Flux. Magnetic Flux always has a tendency to follow low Reluctance path. The laws of Magnetic Circuit are quite similar to the Electric Circuit but the terms used in Magnetic Circuit analysis is different.Let us consider a Toroid having ...
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This post gives is a quick derivation of the formula for calculating the steady state reactive power absorbed by a capacitor when excited by a sinusoidal voltage source.Given a capacitor with a capacitance value of C in Farads, excited by a voltage source V in volts, it will draw a ...
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The behavior of AC current is different than the behavior of DC current. When DC current flows through a conductor, it get uniformly distributed over the whole cross-section of the conductor but when AC current flows, it has a tendency to flow near the surface of the conductor. This behavior ...
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What is Current? Electric Current is defined as the rate of flow of net charge through the conductor with respect to time. The direction of current is conventionally is in the direction of flow of positive charge. It is the flow of charge per unit time. If Q current is ...
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B-H curve or Magnetization/saturation curve is basically the graphical relationship between the magnetic flux density B and magnetic filed intensity H for a given magnetic material. As we know that,   B = μ0μrH where  μ0 = Permeability of free space = 4πx10-7Tm/A    μr = Relative Permeability of material ...
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Mechanical and Electrical angle are frequently used in the study of Electrical Machine theory and therefore it is very important to have a crystal clear concept of these two terms and the relationship between them. In this post we will also discuss about the Synchronous Speed and their relationship with ...
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The terms Steady State or Transient State is defined not only for electrical systems, but for many other physical systems also.The transient response does not depend on the source i.e. forcing function, applied. It is purely natural response. Mostly transient response is associated to on/off events. Previously the circuit is ...
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Coulomb's law is an experimental law formulated in 1785 by the French colonel, Charles Augustin de Coulomb. It deals with the force a point charge exerts on another point charge. By a point charge we mean a charge that is located on a body whose dimensions are much smaller than ...
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Impedance is the resistive parameter offered to the flow of current in a circuit. Whenever current flows or electrons move through a closed circuit, due to collisions of electrons, resistance is offered to the flow of current. In a DC circuit, impedance is nothing but resistance. But in an AC ...
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As we know that Star & Delta Connection only possible in 3 phase system, so in our domestic system it is not possible, because generally all house hold electrical equipment are designed with single phase supply.Difference between Star & Delta:Star Connected System:Star connection is used where we require Neutral terminal ...
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If someone ask you whether current and voltage are vector or scalar quantity the obviously you will answer that they are scalar quantity. Next, the question arises if current and voltage are scalar quantity then why do we represent then in form of vector which is famously known as Phasor? ...
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The Dry Cell was discovered by French Scientist G. Leclanche in 1868. It is the most common cell which is the improved version of Leclanche Cell. It is a portable cell and free from liquid. This is why, it is called dry cell as it do not contain any liquid ...
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Faraday’s Law of Electromagnetic Induction states that, whenever the flux of magnetic field through the area bounded by a closed conducting loop changes, an emf is produced in the loop. The produced emf is given by ξ = -dØ/dt  where Ø = ∫B.ds is the flux of the magnetic field ...
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Motional EMF is the potential difference produced across the length of a conductor moving in a Magnetic Field.   Suppose a conductor of length l is moving with a velocity v in a uniform magnetic field B as shown in figure below.   As the conductor is having mobile electrons ...
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