why an electric current flows from positive to negative why not from negative to positive?

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Solution

Electric current is detected due to the motion of electrons. The direction of flow of electrons gives you the direction of electric current.
The electrons flow from the negative terminal to the positive terminal due to a potential difference between the terminals of a cell.
The direction of current is conventionally taken to be from positive to negative as it was earlier thought that the current flows due to the movement of positive charges.

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Why do current flows from positive terminal to negative terminal but electrons flow from negative to positive terminal?

In an electric circuit, the current flows from positive to negative terminal.

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