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the answer is not a lot as long as the circuit of any appliance is not damaged the ground is not in use.The ground wire is a safety it takes stray electricity away from faulty devices and into the ground.All houses and buildings should be wired with a ground wire.the ground wire is a yellow/green coloured wire and is not actually connected to any power it is normally connected through the house wiring to a rod driven into the ground outside the house so if something fails the stray current takes the easiest route which is to the ground rod and in this way safeguard's from electrocution and fires i hope this helped i am not an electrician

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