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My USB cable has 4 colours, red, blue, brown, and yellow. What are the positive and negative? - Quora
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DTK 120W 19.5V 6.15A Laptop Charger Replacement for HP Notebook Computer PC Power Cord Supply Lead AC Adapter Pavilion ENVY OMEN WASD Connector:4.5 x 3.0mm : Amazon.co.uk: Computers & Accessories
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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