Is the voltage in the United States 11v or 12v?

The voltage in the United States is 11v.\r\n r \ nTo travel, do business or work in the United States, and bring small appliances such as hair dryers, mp3 players, digital cameras, notebooks and chargers to the United States, transformers and adapter sockets are needed; Because the voltage of 22V used by domestic households is different from that of 11V used by some countries in the world. Such as Japan, the United States, Canada and so on are all low voltage of 11V V. \ r \ n \ r \ nAt present, there are two types of indoor electricity used in the world, which are 1 V ~ 13 V and 22 ~ 24 V respectively. 1V, 11 ~ 13 V are classified as low voltages such as those in the United States, Japan, etc. and ships, because its equipment is designed according to such low voltages, with emphasis on safety; 22 ~ 24 V is called high voltage, which includes 22 V in China, 23 V in Britain and many European countries. The emphasis is on efficiency. Ordinary electrical appliances belonging to the same voltage system are taken abroad for use, and the voltage is generally not a problem, because most electrical appliances have a voltage floating range of 2%, such as electric furnaces and rice cookers, because even in China, the highest voltage can sometimes reach 25 volts, so the voltage of 23 volts only makes them heat up faster, and there is not much problem.