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The power frequency of the utility grid is synchronized with the rotational speed of the turbines in the power plants.
If the turbines in a power plant rotate at 60 revolutions per second, then the power frequency in that area is 60 Hz.
In Hong Kong, the turbines in the power plants rotate at 50 revolutions per second, so the power frequency, also known as the utility frequency, is 50 Hz.
Electrical clocks and timers designed for 60 Hz may run slightly slower in Hong Kong due to the difference in frequency. However, most other household appliances are not significantly affected and may not be easily noticeable.
Many electrical appliances are marked with 50Hz/60Hz, indicating that they can be used with both 50 Hz and 60 Hz power sources. The "/" symbol represents "or."
To the best of my knowledge, power sources worldwide typically have fixed frequencies of either 50 Hz or 60 Hz and not other values like 51, 52, and so on.
The choice of setting the frequency to 60 Hz is likely related to time calculations, as there are 60 minutes in an hour, 60 seconds in a minute, and 60 Hz in a second – it follows a convenient pattern. As for 50 Hz, it might have been chosen for simplicity and compatibility with multiples of five and ten.