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
Dell Inspiron charger wiring | Tom's Hardware Forum
Dell 19.5V 3.34A DC 4.5*3.0 Laptop Small Pin Power Pack | Laptop Parts
Dell 19.5v 3.34A big pin Laptop Power Adapter - SUNX TECHNOLOGIES (PVT) LTD | LAPTOP REPAIR | LAPTOP ACCESSORIES ONLINE STORE
Dell 19.5V 3.34A 65W 4.5*3.0mm Original AC Power Adapter Charger for Dell laptop 6TM1C PA-1650-02D2 (Dell 65W Adapter 4.5*3.0mm) For Dell Latitude 3510 3410 P101F P129G P101F001 P101F002 P129G001 P129G002 Compatible with
power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange