![]() Even though the electrical grid in the US uses a voltage of 110V, many American appliances are rated for a range of 100-120V. The voltage used in almost every country is either 120V (in North America) or 230V (most other countries) however, Japan uses a voltage of 100V, the lowest in the world. The difference in frequency generally isn’t an issue, but it can prevent clocks and timers from keeping time correctly. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy. In the eastern part of the country, which includes Tokyo, the frequency is 50 Hz in the western part, including Osaka and Kyoto, it’s 60 Hz. Alternating current ( AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Most countries use the same frequency everywhere, but that’s not the case in Japan. ![]() The electrical grid in Japan has two other oddities. Unlike in the US, the ungrounded, two flat pronged outlet type (pictured) is most common in Japan. Type A sockets are ungrounded and have two flat holes, while Type B sockets are grounded and have a third hole. If you take a scroll down the page, you will notice that most countries have a well. Image credit: Eric Naeseth Jacket Material Buyers may specify jacket material when considering AC power cords. The list also reveals that types A and C are the most frequently used electric plugs worldwide. Japan is one of the only countries outside the Western Hemisphere to use Type A and B outlets, the same as in the US. The table shows that in most countries the mains supply is between 220 and 240 volts (50 or 60 Hz) countries that operate on 100-127 volts are greatly outnumbered. Here is an actual photo of a Japanese power outlet Plug & socket types around the world There are currently 15 types of domestic electrical outlet plugs in use worldwide, each of which has been assigned a letter by the US Department of Commerce International Trade Administration (ITA), starting with A and moving through the alphabet.
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