why USA adopt for 110v and 60 Hz supply for the houses?

Answer 1

Good question. There was a time (about 1900), early in the history of electricity, when some sections of the U.S. used DC current to supply the fortunate few houses that could afford electricity. But then, as more and more houses demanded electricity, they found that DC voltage just couldn't be transmitted over lines far enough to reach the additional houses.

So they turned to alternating current because tranformers can be used to boost the voltage out in the main trunk lines that feed the lines that feed the houses. That way, with AC voltage, the voltages can be kept up even though there are losses enroute to the houses.

The 60 cps (Hz) came about because the largest producer of residential power was using that frequency...more or less arbitrarily. Other companies used 25 Hz, but they eventually adopted the 60 Hz of the larger company (Westinghouse) because it made economic sense.

Answer 2

Less energy required to produce that power when compared to 220v. 110v shock is tolerable without much adverse effects. Devices costs less with this power requirements.
There are many countries that use this 110v ratings.
In India also there was a proposal to modify 220v to 110v., but it's very enormlous job. however there was one interesting proposal i.e. install a small transformer at the utility source to step down to 110v.

Answer 3

Firstly because of less voltage less impact of electric shok and 50Hz-60 Hz doesnt make much difference in RF disturbances
for transmission wire thickness needed is half of the 220v.

Answer 4

they started with 25 hz. after they found how to make thinner laminates, they went to higher frequency to make the equipment smaller. I think they just chose 60 hz and it stuck with it. It is as high as they can go with the huge power transformers at substations.