Aaron Fude wrote:
When translating amps to hp for a 120V appliance, is the formula
essentially

120*amps/745.699872

That would give a 15amp ryobi table saw a rating of 2.41hp which is
ridiculously high, no? Is my formula not right, or is 2.41hp not
ridiculous or is there something else I'm missing?

Missing several things; Doug pointed out a couple (LRA and efficiency,
specifically) -- there is at least the power factor in addition which
will be roughly another 20% for this motor, probably (Ryobi is not
particularly noted for high-end products).

So, that 15A wouldn't be running amps, but if it were the hp would be
something otoo 120*15*0.8*0.8/746 -- ~1.5 hp. It's probably about 1 hp
running at about 10A running under load.

There's a fairly nice discussion on the factors involved here--I posted
a response not terribly long ago either here or in the rec.woodworking
group that also had links to some motor spec sheets; don't have that
handy but a search of any of the motor manufacturers will show
representative numbers for various levels of quality/pricing motors.
Most "run of the mill" consumer-grade/homeowner tool-grade are not the
high efficiency types at all--they are more expensive than most tools
use that are carried by the BORGs. In part this is price but it's also
because they're relatively small as industrial tools/motors go...

http://www.bacharach-training.com/norm/electric.htm

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