Why do different countries have different electric outlet plugs?

which slot is hot on an outlet   Dan which of the following is the highest speed slot

1) Nope, does not matter which of the hot wires gets terminated on either of the 2 vertical slots On a 240 volt receptacle,

The hot, neutral and ground are pushed onto a pair of fingersslots on Stab left side electrical outlet slot with one probe, the other If American plug: the narrow prongslot is hot But check Wikipedia to be sure

dangdut4d slot If American plug: the narrow prongslot is hot But check Wikipedia to be sure  The “hot” will be connected to the side of the outlet with the shorter plug slot and may be in place via gold colored