How to add a 12 V power to Arduino?

Using Arduino Motors, Mechanics, Power and CNC
9

jremington:
You connect a 7-12V power supply to the Arduino, using a barrel jack.

Barrel jack:

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Using wire, you can connect the SAME power supply to other things in parallel.

Use your imagination.

Ah, finally understand, it is the VIN that connects to the external directly. Thank you very much