AS we know the direction of an ac current changes,could u tell me how the directon of ac current changes? and why it is different in different countries?

Dear ramender,

Please ask your question only once.

For the second part,

AC electricity is the type of electricity commonly used in homes and businesses throughout the world. While the flow of electrons through a wire in direct current (DC) electricity is continuous in one direction, the current in AC electricity alternates in direction. The back-and-forth motion occurs between 50 and 60 times per second, depending on the electrical system of the country.

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All the best.

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