Why don't all countries have the same plug and socket?

Original title: why do countries not have a unified socket?Western media: it was born in the world before globalization
People who travel abroad frequently know that in addition to passports and credit CARDS, there is one other thing that should be included in their luggage, and that is the power socket adapter suitable for the destination country, western media reported on March 1.Why doesn't the world have a unified plug and socket?

According to the website of Spanish newspaper el pais on February 26, the international electrotechnical commission (iec) pointed out that there are 15 different types of plugs in the world and the voltage varies from country to country.Go out to want to use electronic equipment in abroad, often can encounter the problem that plug socket does not fit.

Many people think this is a big problem.The plugs in Spain are C and F, Brazil is N, and Mexico is A and B.
According to the report, the socket was born in a world that has not yet been globalized, which is the main reason for the inconsistent plug models around the world.Pablo mayol DE bercia, a spokesman for the Spanish standardization association, points out that the plug was originally conceived by American inventor Harvey hubbell.He invented the detachable connector plug and patented it in 1904.
Established in 1906, the international electrotechnical commission is the world's first international organization for electrical standardization, responsible for international standardization in the field of electrical engineering and electronic engineering.The agency focused early on standardizing electrical equipment rather than plugs and sockets.

Engineers focused on the standardization of plugs and sockets after world war ii, the report said.Before the second world war, the infrastructure of the industrial powers was almost complete.For more than 40 years, from the beginning of the 20th century to 1947, plug and socket development was not subject to any standardized control.Out of commercial interests, most enterprises focus on the domestic market, which leads to the emergence of so many types of plugs around the world.

It is generally accepted that three-end plugs are safer than two-end ones.But mayol DE bertia rejects this view."When it comes to plugs and sockets, safety is Paramount," he said.No matter what model, all plugs and sockets must undergo numerous tests to meet safety standards."
Mayol DE bercia says although there are attempts to introduce a universal plug, it is unlikely to happen soon.Because there are already countless plugs and sockets in the world."Who can persuade a country to change its infrastructure?" he asks.
Now you can buy a plug with a USB port in e-bay and other electronic shopping malls.So is this a solution?Mayol DE bercia says this is one of the possible solutions and a good option for consumers because most electronic devices can work with a USB port.But for now that is only a possibility.Many technical challenges must also be addressed, such as unifying the output power of the USB interface.

Of course, there are other ways to solve this big problem, such as wireless charging systems.But mayor-debertia points out that all solutions must be a normative evolution in order to keep end users safe.

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