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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/Uaob5.jpg)
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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19.5V 3.34A Octagon pin DC Laptop Adapter Charger For Dell Inspiron 1525 6000 8600 PA21 PA-21 AC Power Supply - AliExpress
![Amazon.com: UpBright 4-Pin 5V AC/DC Adapter Compatible with Dell SuperSpeed D3000 WMGHV J22N2 0J22N2 452-11648 452-11646 R47M9 Targus ACP075us ACP70USZ ACP70US Y5T3Y 0Y5T3Y YWDN0 469-4034 332-0446 Power Supply : Electronics Amazon.com: UpBright 4-Pin 5V AC/DC Adapter Compatible with Dell SuperSpeed D3000 WMGHV J22N2 0J22N2 452-11648 452-11646 R47M9 Targus ACP075us ACP70USZ ACP70US Y5T3Y 0Y5T3Y YWDN0 469-4034 332-0446 Power Supply : Electronics](https://m.media-amazon.com/images/I/61ienO2AtsL._AC_UF894,1000_QL80_.jpg)
Amazon.com: UpBright 4-Pin 5V AC/DC Adapter Compatible with Dell SuperSpeed D3000 WMGHV J22N2 0J22N2 452-11648 452-11646 R47M9 Targus ACP075us ACP70USZ ACP70US Y5T3Y 0Y5T3Y YWDN0 469-4034 332-0446 Power Supply : Electronics
![Amazon.com: PA-4E DA130PE1-00 JU012 CM161(Tip 7.4mm) for Dell Inspiron 7559 Charger,Dell 130W Laptop Charger,Dell 130w AC Adapter,Dell Docking Station Power Cord, Dell XPS 15(L502x) 17(L702x) Charger : Electronics Amazon.com: PA-4E DA130PE1-00 JU012 CM161(Tip 7.4mm) for Dell Inspiron 7559 Charger,Dell 130W Laptop Charger,Dell 130w AC Adapter,Dell Docking Station Power Cord, Dell XPS 15(L502x) 17(L702x) Charger : Electronics](https://m.media-amazon.com/images/I/41FFBPlzoBL._AC_.jpg)
Amazon.com: PA-4E DA130PE1-00 JU012 CM161(Tip 7.4mm) for Dell Inspiron 7559 Charger,Dell 130W Laptop Charger,Dell 130w AC Adapter,Dell Docking Station Power Cord, Dell XPS 15(L502x) 17(L702x) Charger : Electronics
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Dell Laptop compatible charger Techie Brand 90W 19.5V 4.62A Pin Size 7.4mm x 5.0mm x 0.6mm | Laptop Charger | Laptop Battery
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