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Old 05-02-2008
fancyStufkiller fancyStufkiller is offline
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I would suggest to ask this question at, may be there are some genius, who can answer all your questions.

Generally, i would say the 220v system is more efficient, regarding power delivery and losses.
But this comes at the price of better isolation requirements and the higher lethal risk if something is going wrong.
This is caused by the ohms law, (I=U/R) which means that at 220v the lethal current is more easily reached then with 110v.

Frequency is choose for the intended consumer. Not that i can tell you much about the details, but for very big motors (e.g. electric locomotive) a far lower frequency is used (16,70 Hz in DE, CH and AU).
I think that the figures are chosen due to material and physical limits at the beginning of the electric age.
Then they are kept to be compatible.
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