The most important uses and applications of a transformer are:
  • It can rise or lower the level of level of Voltage or Current ( when voltage increases, current decreases and vice virsa because  P =V x I, and Power is same in an AC Circuit.
  • It can increase or decrease the value of capacitor, an inductor or resistance in an AC circuit. It can thus act as an impedance transferring device.  
  • It can be used to prevent DC from passing from one circuit to the other. 
  • it can isolate two circuits electrically.
Transformer is the main reason to transmit and distribute power in AC instead of DC, because Transformer not work on DC so there are too difficulties to transmit power in DC. in the DC Transition and distribution, the level of voltage Step up by Buck and Boost Converter but it is too costly and not suitable economically.
The main application of Transformer is to Step up ( Increase) or Step down (Decries) the level of Voltage.
in other words, Increase or decries the level of Current, while Power must be same.
Other Uses and application of Transformer:
It step up the level of voltage at generation side before transmission and distribution.
in distribution side, for commercial or domestic use of electricity, transformer step down ( decries) the level of voltage for example form 11kV to 220 V single phase and 440 V three phase.
The Current Transformer and Potential Transformer also used power system and in the industry
also it is used for impedance matching.

Pole-mounted distribution transformer with center-tapped secondary winding used to provide "split-phase" power for residential and light commercial service, which in North America is typically rated 120/240 volt.Sources of Image and attribution  Wikipedia


  1. Nice post! It is very interesting.

  2. Anonymous10:40

    this we already know

    1. But everyone dont know.

    2. Anonymous11:04

      Dear Anonymous.. if u know any further information u post it in the comment...
      This is very useful information

  3. Anonymous04:23

    thank you for simplifying things :)
    It is really good for students just started studying electrical engineering!

  4. Anonymous22:27

    Thanks for your works

  5. Thanks for your contribution, this information's are very helpful.

  6. Anonymous13:15

    thanks for your information

  7. this help me a lot for my presentation thanks :)

  8. Anonymous20:22

    What is buck and boost???

  9. Anonymous10:40

    can we convert ac into dc using transformer?

  10. Anonymous11:06

    hi. how can i cite this page? thanks :)