why did countries choose different hz and voltages and why do some use 60 and other 50hz, why have a 50hz 240v and not 60hz 240v or even 50hz 250v to make consistent with the hz
In: Physics
When the electrical systems of the world were created, the world was much less standardized. This started before the Internet (or even the telephone), before easy travel between continents, and before mass manufacturing of electrical appliances.
Each country/region came up with its own standards as electrical systems grew. Once you have a system, it’s really hard to change (imagine asking every person in a country to buy/install new cords/plugs for everything they own).
The hassle of changing the system is not worth the minor benefits of having fewer systems.
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