There is no standard power supply voltage and frequency in the world, that is, the number of times the current direction changes every second, which is different everywhere. In addition, the plug shape, plug hole, plug size and socket are different in many countries. Those surfaces There are many inconveniences in the point that are not important.
Most products are easy to buy abroad, but you can't connect to the power supply when you get home. There are two ways to solve this problem: you can cut off the original plug, replace it with your country's standard plug, or buy an inconvenient and ugly one. Power adapter.
Although it is easy to buy a plug adapter or a new local plug for your foreign product, in most cases, the problem is only half solved because the voltage may be inconsistent. 110V electrical products designed for North America or Japan, if plugged into a European outlet, will showcase a beautiful fireworks show that produces sparks and smoke. No single voltage, frequency and global standard plugs will make the manufacturer Taking on additional costs and increasing external burdens is pure waste and unnecessary pollution!
Most countries in Europe and the world use twice as much voltage as the United States. That is between 220 and 240V, but in most parts of Japan and the United States, the voltage is between 100 and 127V. The original European voltage is also 110V, and now Japan and the United States The same. Later, they thought that increasing the voltage with the same diameter of the copper wire would reduce the power loss. At that time, the United States wanted to change, but because all electrical products required cost, they decided not to do that.
Now all new American buildings have a voltage of 230V between the neutral and the fire line of 115V. Larger products, such as ovens, are connected to the 230V power supply. Americans with European equipment connect the products. On other outlets. There are now 175 countries around the world using 220-240V (50 or 60Hz). Other 39 countries use 100-127V.
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