## Basic of Electrical Engineering and Basic Electrical Formulas

InThis Post You will get Basic Knowledge of Electrical Engineering and Basic Electrical Formulas that will help you in your study.

## Basic of Electrical Engineering

### 1 - Phasor

It is a Vector which Represent by its Magnitude and Direction. In Electrical We called Magnitude "Amplitude" and Direction Called "Phase Angle". Phase Angle may be Lead, Legg or in the same Phase.

**There are two forms of Phase -**

A- Rectangular Form

In This case, We Represent Phasor with Real and Imaginary Part.

B- Poler Form

In This case, Phasor is Represent by its Magnitude and Phase Angle.

###

2 - A.C. Circuit

An A.C. Circuit is an Complex Circuit due to Presense of Imductance and Capistance. The A.C. Circuit have three Power (Apprent Power, Active Power and Reactive Power)

**Type of A.C. Circuit -**

A - Series Circuit

B - Parallal Circuit

### 3 - Impedance

It is the Equivalent Resistance of the A.C. Circuit. It is formed by Resistance and Reactance (Inductive or Capacitive).

### 4- Resonance

It is a Phenomena in which all the Complex Part of the Circuit is Disappeared.

- At Resonance Imaginary Part will be Zero = 0
- At Resonance A.C. Circuit Becomes D.C. Circuit.
- The Power Factor for Resonance Circuit is Always Unity.

### 5 - Quality Factor

It is the Ratio of Reactance (Inductive or Capacitive) to the Resistance.

Q = Xl/R or Xc/R

### 6 - Voltage Magnification

It is the Ratio of Voltage Across Inductor or Capacitor to the Voltage Across Resistor.

V.M. = Vl/Vr or Vc/Vr

### 7 - Bandwidth

It is the Difference of two Cut Off Frequency.

B.W. = F2 - F1

###

8 - Cut-Off Frequency

It is that value of frequency at which the current becomes 1/√2 (.707) times of the Maximum Value or it is that value of Frequency where Power becomes 1/2 of the Maximum Value.

### 9 - Relation Between Bandwidth, Natural Frequency, and Quality Factor

Q = ω (Omega)/ Bandwidth

### 10 - Admittance

It is also the Complex part of A.C. Circuit it is formed by Conductance and Susceptance (S.I. Unit - Mho or Siemens).

Y = G + j B

It is Reciprocal of Impedance.

### 11 - Electric Charge

It is the Quantity Present in all the Material. It is Denoted by - Q

Q = Ne, Unit = Coulomb

### 12 - Electric Field Intensity

It is also a Force which is applied on the electric field on Unit Positive Charge.

E = F/Q

### 13 - Direction and Properties of Electric Field Lines

**Direction**- It's Direction away from Positive to Negative.

**Properties**-

1- The Direction of Electric Field Line at any point on the Electric Field Lines is Obtained by Drawing a Tangent.

2- The Electric Lines Never Intersect to Each other because at Intersection Point there will be two directions of Electric Field Lines, which is Impossible.

3- The Electric Field Lines Never form a loop.

## Basic Electrical Formulas

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#Basic of Electrical Engineering

#Basic Electrical Formulas

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