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In addition to different power outlets in different countries, in fact, the voltage is also inconsistent, Haitao's electrical appliances are not just a plug converter can be used, do not clear the voltage problem, do you mean that you are Haitaoda?
First of all, let's briefly review the history of voltage development, which will start from the time when electricity was just popularized more than 100 years ago... 
Remember the Edison who carried the light bulbs? (The inventor of the bulb was actually Henry Goebbels, which was more than a decade older than Edison.) In 1879, the carbon filament incandescent lamp he produced was operated at 110V, which was still DC, and later converted to AC voltage. It has not changed, 110V/60Hz has gradually developed into the rated voltage standard of the United States, and the surrounding countries such as Canada, Mexico, Cuba and other countries also adopt this standard.
Japan's standard voltage is 100V, which is mainly affected by the United States. It is interesting that the frequencies in the eastern and western regions are different. This is because the reconstruction tasks of the eastern and western power systems after the end of World War II were taken over by the United Kingdom and the United States, and 50 Hz in the east. The west is 60Hz. China's Taiwan region is affected by Japan and uses 110V voltage.
Europe was also 110V at the earliest, but it was later changed to 220V to improve the power transmission efficiency. When the AC grid was not built on a large scale, it began to be converted to 220V/50Hz voltage specifications. They were also used in the former colonies of Asia, Africa and Latin America. This standard.
Before the liberation of our country, electricity was already used in some areas, but there is no uniform standard for the AC grid. Both 110V and 220V voltages exist at the same time. In 1930, the then National Government announced China's first voltage frequency standard, 220V/50Hz became China's standard voltage and standard frequency, which was adopted after the founding of New China.
In this way, although the voltage belongs to the category of electrical development history, it is actually a historical issue. It may be possible to have a deeper understanding of the history textbook.
In general, the voltage in the world can be divided into 110V region (100~130V) and 220V region (220~240V). At present, there are more than 120 countries in the world using 220V voltage, and there are about 30 countries. It is 110V voltage, and some countries do not have a unified standard. Both types of voltages exist at the same time.
With the increasing number of electrical appliances in the home, it is almost impossible to replace the voltage standard now. The state of the two voltages will continue to exist for a long time...
If you don't go abroad, you are too lazy to have a variety of electrical appliances, and how much voltage it is. If you want to bring domestic electrical appliances to foreign countries, or buy electrical appliances from abroad, then the applicable voltage range of electrical appliances must be clearly defined in advance. Wrong is a tragedy.
Can you still have a happy Haitao? Of course, a transformer can solve all problems.
What is the transformer? We know that there will be a lot of losses in the process of power transmission from the power station to thousands of households. Finally, the voltage at home will be pitiful. At this time, the transformer needs to obtain high-voltage power. After long-distance trekking, the transformer will be high. The piezoelectricity becomes 220V.
For the electrical appliances used everyday, the meaning of the transformer is also the same, but it only needs to switch between 110V - 220V, not the giant thing seen outdoors, and the smaller one is not a problem in the suitcase.
Buying a transformer depends on determining the rated capacity according to the power parameters of the appliance. Small electric appliances such as electric toothbrushes and razors below 50W can be bought with a smaller transformer. If it is a hundred-watt electrical appliance, it needs a larger rated capacity. transformer.
Transformers must buy enough power, it is best to buy a larger one, the carrying capacity is stronger, and later upgraded more power appliances can still be used.
Of course, there are some products that support the global voltage and can automatically adapt to the voltages of different countries. This eliminates the need to use transformers. For example, mobile phone charging heads are generally global voltages, and only need to prepare plug converters.
The above is some little knowledge about voltage. Is it simpler and clearer than plugs of various shapes in different countries?