Why do plugs have 2 pins and 3 pins?
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Answer:
The plugs having 2 pins are devices which can easily handle high voltages.
The plugs having 3 pins have 3 wires, a negative, a positive and an earthing wire because these cannot handle high voltages.
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In order to provide safety, an earth connection had to be fitted to 2-pole plugs for these devices. In all plug types, this earth connection was fitted as a 3rd pin. There is an exception to this, which is the Schuko plug where the earth connection is located on the side of the plug and made of metal contact surfaces.
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