On Wed, 9 Feb 2011 13:00:32 -0800, "Jon Danniken"
wrote:

If an electric motor with 80% efficiency is pulling 16A at 120V, what is the
horsepower?

Going by (16)(120)(0.8)/746, I get about 2 HP.

Is this right?


If you're trying to figure out how much HP is being produced at the
shaft you also need to account for power factor. A typical small
induction motor will draw around 60% of its nameplate current with
*no* load.

80% efficiency sounds high for a 2HP single phase motor. Full load
amps for a normal 2HP induction motor is closer to 25A @ 120V.

--
Ned Simmons