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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
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
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power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange
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