In the US, household current is 120VAC... so to get a 240V circuit, the AC come into the circuit breaker box on two 120VAC feeds. The outlets are generally wired with three wires. I've probably botched the explanation a bit.. but that's the gist of it, and it's been a long time since I've had to install any 240V equipment, so I'm a bit rusty.
Most of the rest of the world went with 240VAC so they could use smaller transmission lines and such, and as I understand it, that was what Nikola Tesla had advocated... but Edison was set on using 110VDC and then switched over to 110VAC.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.