Electrical power is the rate per unit time at which the amount of electrical energy that is transformed to some other form of energy.Electrical Power is classified as Active Power, Reactive Power, and Apparent Power.

**Electrical power is an important aspects of any electrical and electronics circuits. In this article, we will discuss all about Electrical power and its significance.**

##
**Electrical Power Definition:**

In general science power is simply defined as the capacity to do work. In other words, it is defined as the rate of doing work.

Whereas In electrical engineering, **Electrical power** is the rate per unit time at which the amount of electrical energy is transformed into some other form of energy (such as heat, light, mechanical power, etc). Electrical power is one of the key concepts associated with Electrical
Engineering.

Mathematically, Electrical power is defined as the product of voltage drop across the electrical element in the circuit and current flowing through it. It is measured in terms of Electrical Energy per unit time.

##
**Unit of Electrical Power**

When
we talk about Electrical Power then it is considered as Active power consumed by
the circuit element. So the unit of Electrical power (Active power) is **Watt**or joule per second

**.**

**[ ##eye## Different Parts of transformer and their functions]**

**Watt **is the SI unit of the power which is defined as the rate of conversion of 1-joule electrical energy per unit second.

**V**=

**1**volt,

**I**=

**1**Amp.

**(P) = V*I =**

**1*1 = 1**

**Watt**

Hence the Power
consumed in an electrical circuit is said to be **1**** watt** if one ampere current flows through the circuit when a potential difference of one volt maintains across it.

**Watt**is a smaller unit of power. Whereas a larger unit of Electrical power is kW, MW, GW, etc.

1 kW = 1000 Watt

##
**Types of Electrical Power**

**classification of Electrical power**depends on the nature of the current. So electrical power is mainly classified into two types.

*DC power**AC power*

### 1. DC Power

Power consumed in the DC circuit is known as **DC
power**. It is produced by a fuel cell, batteries, DC generators, etc.

Mathematically DC power is defined as the product of voltage and current through the circuit.

SoP = V * I

###
**2. **AC Power

The electrical power associated in AC circuit is known as Complex Power. Whereas Complex Power is the combined form of Active, Reactive, and Apparent Power in AC circuit. So AC power or complex power is further devided into three parts.

- Active Power
- Reactive Power
- Apparent Power

##
**Active Power (kW)**

**Active Power (kW)**

**True power**transmitted to the load for energy conversion. That's why it is also known as

**True power**or

**Real power**in AC circuit. It is represented by an english alphabet

**'**

**P'**and measured in Watt (W), kilowatt (kW), or Megawatt ( MW).

In the case of DC circuit or in pure resistive AC circuit, active power is calculated as the product of voltage and current in the circuit. Whereas in the case of AC circuit it is calculated as:

##
**Reactive Power (**kVAR**)**** **

Reactive power is not a useful power for consumers so it is interpreted as wattless power. It represents an extra burden on the electricity supply system and on the consumer's bill also. Whereas this is required in the circuit to produce the electric and magnetic field for working of capacitors and inductors in the circuit. It has a direct impact on the power factor of the circuit. It only exists in electrical system when voltage and current in an AC circuits are not in phase.

**[ ##eye## Power Factor Correction techniques]**

This
**reactive power** does not perform any useful work in the circuit. It is denoted by an English alphabet **Q** and measured in VAR, kVAR,
or MVAR.

In the case of the DC circuits, there are no concepts of Reactive Power. Whereas for the AC circuit it is calculated as

##
**Apparent Power (kVA):**

**The combination of**

**Active Power**and

**Reactive Power**is known as

**Apparent Power**. It is the total power of the circuit.

Mathematically Apparent power is defined as the product of root
mean square (RMS) value of voltage and current irrespective of its phase angle. It is denoted by an English alphabet '**S**' and It is measured in kVA, MVA.

In the case of the DC circuit, it is the total power of the circuit. Whereas for the AC circuit it is calculated as :

## Power Triangle

**Power Triangle.**In other words,

**Power triangle is the geometrical representation of Active power, Reactive power, and Apparent power.**In this phasor diagram, voltage is considered as a reference phasor. It is a very useful triangle for finding the power factor of electrical circuits.

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Useful and sample

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