RE: Air Compressers- From a Pro

Message text written by "Randall Young"
>So for example, if the nameplate says 20 amps at
220 volts, 20 * 220 = 4400 voltamps, which is about 4.4 hp.  If they claim
that is a "6hp" compressor ... Warning !
<

That ain't so bad.  If the sticker says "3.5 HP" but the nameplate says 13
amp at 120 V well, 13 amps X 120 V = 1,560 Watts or 1.5 HP.  That is less
than 50% advertized.

Dave

Taken from an actual example