![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/iPDt4.jpg)
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 power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/IkOFo.jpg)
power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange
![6Ft 3 Prong AC Laptop Power Cord Cable for Dell IBM Hp Compaq Asus Sony Toshiba Lenovo Acer Gateway Notebook Computer Charger Spare: IEC-60320 IEC320 C5 to NEMA 5-15P : Amazon.ca: Electronics 6Ft 3 Prong AC Laptop Power Cord Cable for Dell IBM Hp Compaq Asus Sony Toshiba Lenovo Acer Gateway Notebook Computer Charger Spare: IEC-60320 IEC320 C5 to NEMA 5-15P : Amazon.ca: Electronics](https://m.media-amazon.com/images/I/61i79kEn8nL.jpg)
6Ft 3 Prong AC Laptop Power Cord Cable for Dell IBM Hp Compaq Asus Sony Toshiba Lenovo Acer Gateway Notebook Computer Charger Spare: IEC-60320 IEC320 C5 to NEMA 5-15P : Amazon.ca: Electronics
![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
Why do some laptop chargers have three prongs? I get in 2 prongs there is one for positive and one for negative, but why 3? Thanks in advance, sir/ma'am. - Quora
![Dell Inspiron 19.5v 3.34a charger / Dell Inspiron 19.5v 3.34a laptop charger / Dell Inspiron 19.5v 3.34a power cable Dell Inspiron 19.5v 3.34a charger / Dell Inspiron 19.5v 3.34a laptop charger / Dell Inspiron 19.5v 3.34a power cable](https://files.ekmcdn.com/jimbocoy1/images/dell-inspiron-19.5v-3.34a-charger-7.4mm-pin-67101-p.jpg)
Dell Inspiron 19.5v 3.34a charger / Dell Inspiron 19.5v 3.34a laptop charger / Dell Inspiron 19.5v 3.34a power cable
![laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M](https://static-01.daraz.pk/p/9e7655142e0878909371d008aff1f713.jpg)
laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M
![laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M](https://static-01.daraz.pk/p/338e20db27b84a191b40cea36bb6b28f.jpg)
laptop charger 3 pin Cable Cord Connector DC Jack Charger Adapter 7.4 x 5.0 mm Plug Power Supply Cable for H P - D E L L Laptop 1.2M
![Dell Inspiron 3 Pin Laptop Adapter Cable at Rs 20/piece | Laptop Power Cable in New Delhi | ID: 21917374997 Dell Inspiron 3 Pin Laptop Adapter Cable at Rs 20/piece | Laptop Power Cable in New Delhi | ID: 21917374997](http://5.imimg.com/data5/HI/FS/RE/SELLER-99351315/dell-inspiron-3-pin-laptop-adapter-cable.jpg)