There are three types of Electrical Power viz. :  

  1. Apparent Power (S)
  2. Active Power (P)
  3. Reactive Power (Q) 

      In the following sections we will be explaining, each one of them in detail. 

1. Apparent Power (S)

Defination: Product of the rms value of the Voltage and the current, which appears to be the Power consumed, but is actually less than the Real Power consumed.

Defining Equation: S = V x I

Unit: VA (Volt-Ampere)

Load:  1. When the all of the Load is Resistive Load, Apparant Power is Equal to Active Power.

              2. When the all of the Load is Inductive Load, Apparant Power is always greater than Active Power. 

2. active Power (p)

Defination: It is the Real Power consumed, which converts the Energy from one form to another i.e. it does the External Work..

Defining Equation: P = V x I x Cos Phi         ……………For Single phase Power

                                    P = rt 3 x V x I x Cos Phi  …………….For Three Phase Poer 

Unit: W/KW/MW  (Watt/Kilo Watt/Mega Watt)

Load:  1. When  all of the Load is Resistive Load, Active Power is Equal to the Apparent Power. 

3. reactive Power (q)

Defination: It is the  Power taken by the Reactance in a Circuit , which is not available for the External Work.

Defining Equation: Q = V x I x Sin Phi  

Unit: Var/ KVar / MVar  (Volt-Ampere- Reactive / Kilo Volt-Ampere- Reactive/ Mega Volt-Ampere- Reactive)