Why Voltage is same In Parallel Circuits?

Why current remains in series circuit? - • Why current remains sa...
5:16 - From here the most important part of the video starts [This is the essence of this video and why ohms law works] - There is no mathematical proof to ohms law. We just have experimental evidences.
This video also covers these questions:
why voltage is same in parallel circuit
why voltage is constant in parallel circuit
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what is the essence of ohms law?