Question

why electric current is grounded​

Answer 1

By nature, electricity seeks to return its electrons to "ground"—that is, to discharge its negative energy and return to equilibrium. Normally, the current returns toground through the neutral wires in the electrical system. ... A short circuit is when electricitystrays outside the wires it is supposed to flow through.
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Answer 2

In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth.