## Basics of Magnetic Circuit

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....

## Cause of Skin Effect in AC Conductors

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...

## Why Capacitor is Generator of Reactive Power while Inductor an Absorber? Understanding Reactive Power

Consider an Inductive circuit and assume the instantaneous voltage be v = VmSinωt   Then the current will lag behind the voltage by some angle Ø and the instantaneous current will be as   i = ImSin(ωt-Ø)   Now to understand the concept of Reactive...

## Why do Capacitor Block DC but Allows AC

All of us know that a Capacitor do not allow DC current to pass through it but allows AC current. In this post we will discuss this kind of behavior of Capacitor.First we will consider DC supply connected to a parallel plate capacitor as shown...

## Calculation of Reactive Power of a Capacitor

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...

## Difference between Star and Delta Connection

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...

## Difference between Impedance and Admittance

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...

## Why we Replace Voltage Source with Short Circuit and Current Sources with Open Circuits in Thevenin’s and Norton’s Theorem?

We don’t really replace the voltage sources with shorts rather we make the voltage of the voltage sources zero volts.  An ideal voltage source has zero internal impedance by definition of being “ideal”, so if we reduce its voltage to zero, we are left with...