Electricity doesn’t care what the ground is. You can still build up static electricity and shock yourself on an airplane or on the international space station. It just goes from something with a higher potential to a thing with a lower potential. It’s called “ground” because some systems use giant metal rods driven into the ground that we use to dissipate the charge. The electricity literally goes into the ground and is absorbed. Since the earth is huge compared to you, the earth really doesn’t notice an extra few hundred million electrons that shocks you and it’s not even enough to be measured. It’s like dumping a cup of salt into the ocean, did you make the ocean saltier? Yeah, is it measurable? Not really.
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