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power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange
How does a Dell laptop charger with a pin of the same wattage & specs which fits perfectly into an HP not work because it knows it is not an HP charger
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AC power computer Adapter for PA9 pa-9 Dell Inspiron 1100, 2650, 4150, 8200 Latitude C500, C600, M50 laptops and notebook computers
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![power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/iPsc1.jpg)