When people say that the line voltage in the US is 120 volts, do they mean amplitude, Vpp or Vrms?
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\$\begingroup\$ They are referring to Vrms for the line to neutral voltage. \$\endgroup\$– copper.hatCommented Jul 24, 2014 at 6:42
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Line voltage is measured in Vrms, that is why you need a 350V or higher rated cap if you are going to rectify 220VAC.
answered Jul 24, 2014 at 6:40