Take a look at your appliance power cable. If you found three pins at the end of the cable, that means your appliance has grounding system. If your home has electrical grounding system, then you will also find a fitting socket for that power cable. The extra pin (usually round) is used for electrical grounding. That means that extra pin is somehow connected to the ground. Grounding an electrical appliances make it safer to be operated by users. Faulty appliance may jolt the user if not grounded well. During thunderstorm, the appliances will be safer from lightning shocks if they were grounded because the earth will be part of the electrical circuitry resulting to earth absorbing unbalance electrical charges.
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