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Anode and Cathode:

The anode is the terminal of a device that electrons flow out of to complete a circuit. For example, the positive terminal of a thyristor is the anode.
The cathode is the terminal that electrons flow into to complete a circuit. For example, the negative or earth terminal of a thyristor is the cathode.

Be careful to avoid confusion here: We are saying that the anode is the terminal that electrons flow out of to complete a circuit, yet we think of the electricity as flowing in the positive and out the negative terminal.

The explanation is that we are thinking in terms of the conventional theory(+ to -), yet we are dealing with an electronic device, and we know that operates in accordance with the electron flow theory (- to +).

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