I think you mean "what is the voltage of the electric power distribution in US houses" It's called 240 volt single phase, which is a misnomer, as it is actually two phases of 120 volts each. Most outlets are connected to one of those phases and supply 120 volts to appliances. Some appliances that require more power connect to both phases for 240 volts.
Addendum to the answer:
The answer above might look a bit vague, the voltage in the US is 120V (same as Canada, most of Europe is 220-240 V), the electrical frequency is 60 Hz. Plugs used are A or B.
120 volts to most outlets and all lights. Dryer, stove, A/C, water heater, and some other things require 240 volts.
Normal residential voltage in the US is 120/240 volts.
All lights and wall outlets are 120 volts except appliances that require 240 volts such as dryer, water heater, furnace, A/C, oven, cooktop, etc.
220-240 Volts is the voltage in our homes
anywhere, smart one That's right, anywhere. Small, efficient wind generators have now been designed that can be placed nearly anywhere the wind blows. This includes homesteads, schools, green houses, city houses, boats, at campsites, etc. So, not only can you use the energy produced from wind everywhere we use electricity now, we can also generate it at the site of consumption.
I assume you mean "Why" rather than "What". Simply stated, there are fewer transmission losses using high voltage, so the large power lines run at high voltage, but for home use, high voltage would be dangerous and would require considerably more insulation, so it is stepped down to about 115V RMS (root mean square average) for home use. Fewer people get killed and fewer houses burn down that way.
Yes
Because the supply voltage is common to each branch of a parallel circuit, each appliance receives its rated voltage which is necessary for the appliance to operate at its rated power. This is the main reason. Another reason is, should one appliance fail, then -unlike a series circuit- the other appliances will keep working.
Power transformers may be step-up or step-down. Distribution transformers are step-down. Isolation transformers are 1:1 ration transformers. Matching transformers are used in electronic circuits for impedence matching purposes. Instrument transformers are used to measure high-voltage voltages and currents or to operate protective systems.
There are about 1000 to 2000 houses are sold in the United States everyday. You can read more at www.zillow.com/homes/for_sale or www.census.gov/newhomesales
The President of the United States and his/her family.
The Conference Committee has the responsibility of working out the differences between legislation passed in both houses. Both houses refers to the United States House of Representatives, and the United States Senate.
bicameral
How many fires did the United States have in 2009
That man possesses nine houses in the United States.
The United States Congress has two houses. The first is the Senate, and the second is the House of Representatives.
In the United States, the legislative branch of government is made up of the Senate and the House of Representatives. The two houses form the United States Congress.
The two houses are collectively known as the United States Congress.
At the present time, brothels ("whore houses") are legal only in certain areas of the state of Nevada.
=you should go to a bar mate, get drunk, not be a total BOFF!=
In 2010, it was recorded that just over 15% of the population of the United States live in poor houses below the poverty line. It is a higher percentage than was recorded in 1995, which stood at 11.5%.