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A convention is a set of agreed, stipulated, or generally accepted norms. It typically helps common efficiency or understanding but is not required, as opposed to a strict standard or protocol.

4 votes

Why standard voltage is $110/220~\mathrm{V}$ and not $500~\mathrm{V}$?

Safety is the reason why it is done so. Higher (than $110\mathrm{V}/220\mathrm{V}$) potential difference between a human body and a circuit will result in a very, very severe electrical shock. Of cour …
Faraaz Ahmad's user avatar