Main Article Content
Abstract
In some country there is a power supply of 50 Hz 220 V and in some country 60 Hz 110 V. There exist some logic and we can say that there is no any logic between them. When we go through the history of this topic then we got that there is no any logic but if we think about it in term of Electrical Theories then we got some absolute logic of these power supply. It holds some advantages and disadvantages and also some losses. We took a look on this matter and observe some parameters which are really interesting and necessary to know about them.