## Differences between a Phasor and a Vector

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? We will discuss here this … Read more

## Why 400 kV not directly Stepped Down to 33 kV? Why as 400 / 132 kV then132/66 kV finally 66/33 kV?

In electric power Transmission and Distribution, power is transmitted at a voltage level of 400 kV to reduce losses and then at the substation, it is stepped down to 132 kV at which electric power is transmitted and then at substation it is again stepped down to 33 kV. Power is then transmitted at 33 … Read more

## What is Choke Coil?

If someone chokes a person, they can’t breathe, the flow of air is stopped. The name Choke comes from same idea. There is some energy that we want to Choke or prevent flowing in our circuit in or out of our circuit. We might want to prevent the power or ground lines in a circuit … Read more

## Parallel Resonance Circuit – A Rejecter Circuit

What is Parallel Resonance Circuit? Parallel resonant circuit is a generic term which consists of resistor, inductor as well as a capacitor in parallel connection. A parallel circuit containing a resistance, R, an inductance, L and a capacitance, C will produce a parallel resonance circuit when the resultant current through the parallel combination is in … Read more

## Why Silicon (Si) Diodes are Preferred over Germanium (Ge) Diodes?

As we know, both Silicon and Germanium are semiconductor devices. But the present trend is to use Silicon instead of Germanium in many devices like SMPS etc. The reasons for using Silicon Diodes over Germanium Diodes this are: At room temperature, Silicon crystal has fewer free electrons than Germanium crystal. This implies that silicon will … Read more

## Why Series Resonance Circuit Called an Acceptor Circuit?

RLC Series Circuit is shown below. We will consider RLC Series Circuit for Resonance. At Resonance, Impedance of Inductor = Impedance of Capacitor   Therefore, ωL = 1/ωC, where w is angular frequency =2πf   ω2LC = 1   ω2 = 1/LC   Therefore, at Resonance the Impedance of RLC circuit = R Since the … Read more

## Q Factor / Quality Factor of a Coil

The ratio of the inductance L to the resistance R of a coil remains constant for different winding arrangements in the same volume and shape. It makes sense to define this value as a figure of merit to distinguish different coil structures. The quality factor Q is defined by this ratio of L and R. … Read more