الفرق بين تردد 50 هرتز و 60 هرتز؟ - The difference between Frequencies 50 Hz and 60 Hz

How to generate power with 50 or 60 Hz frequency and what is the difference between them? كيف يتم توليد تردد 50 هرتز او 60 هرتز وما الفرق بين تردد 50...