Like the title says what does it exactly mean when something is grounded? What does it serve for with humans and electrical system?
Also presume someone somehow gets zapped by a massive amount of energy from some source: is it safer or worse to be grounded and does it matter what we are grounded to?
In: Physics
If you have a switch, light fixture or some kind of machine that has power running to it, you only want it running to specific parts of that machine. A loose wire or something else can electrify the housing and create a danger to the user. For that reason a wire is attached to the housing and is given a low resistance path back to earth instead of going through you. On plugs and outlets this what the bottom prong is.
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