Why do different countries have different electric outlet plugs?

which slot is hot on an outlet
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The short slot is the hot, the long slot is the neutral and the U-shaped slot is the ground Are the hot and neutral wires reversed? Are the

Incorrectly wired receptacles are not uncommon A three-slot receptacle has a hot-slot , a neutral slot and a grounding slot  On a 30-amp dryer outlet, you'll have one slot with a right-angle The two “hot” slots should have approximately 240 volts These slots

zeus son of kronos slot machine outlets, which are required by code these days A 2-prong outlet has a hot wire and a neutral wire, but a 3-prong outlet also has a ground wire  Measure the voltage to determine if the outlet has power Using one hand, insert a probe into each vertical slot on the outlet Red goes into