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Zoe Morris——Studied at the University of British Columbia, Lives in Vancouver, Canada.
The household electricity our North American appliances use is delivered at 120VAC (volts alternating current) 60 Hz. (60 cycles/second). When the electric current flows it rises from 0 volts to 120 volts back to 0 volts and then it falls to negative 120 volts and rises back to 0 volts.read more >>+119962023-06-08 11:05:47
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