Which way do electrons flow in a electrical circuit?

Electrons in a circuit is always from the negative terminal to the positive terminal.

Explanation:

A circuit is nothing but the combination of electronic devices in a sequence. There are rules for connecting electronic devices. Positive of any of the device should be connected to the positive pole of the battery or current. The flow of current in a circuit is always from the positive terminal of the battery or the device used to connect the current to the negative terminal of the device, whereas the electrons the charge carries move from negative to positive because of the negative charge of the electron.

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