Power transformer transmission and the working formula are the same as voltage stepup transformer. Actually, a power transformer is a giant size transformer of a stepup transformer. The power transformer is used in the electrical sector to increase the voltage. Almost all of the transformers are working with the same process, following electromagnetic induction theory. In the blog, the power transformer working equation is given below with an example.
Power Transformer Equations
The power transformer equation depends on the winding turn number, current flow, and the voltage between the primary and secondary windings. If a transformer’s input coil turns, the number is less than the output coil’s number is called a stepup transformer. Step down transformer is the opposite of this process. The power transformer’s formula is Np/Ns=Vp/Vs or Ip/Is=Vs/Vp
Here is the elaboration of the letter is,

 Np= Input coil turns number
 Ns= Output coil turns number
 Vp= Input voltage
 Vs= Output voltage
 Ip= Input current
 Is= Output current
Power Transformer Formula Example
Example 1: If the primary winding of a transformer is 300, then the secondary winding is 600. The initial voltage is 500v. So what is the secondary voltage?
Solution:
Here is
Np= 300
Ns= 600
Vp= 500
Vs=?
According to the transformers equation, Vs= Ns*(Vp/Np)= 600*(500/300)= 1000
The answer of the Vs is 1000 volt.
Example 2: If the primary voltage of a transformer is 200, then the secondary voltage is 300. The initial current 10A. So what is the secondary current?
Solution:
Here is
Vp= 200
Vs= 300
Ip= 10
Is=?
According to the transformers equation, Is= Ip*(Vp/Vs)= 10* (200/300)= 6.67
The answer of the Is is 6.67 ampere.
This formula can calculate output voltage, output current, input voltage, and input current. This is a straightforward equation for the calculation of a transformer voltage and other things.