Let's talk compressors (for the shop)

Don't pay attention to HP ratings. For the most part they are bogus, the only thing that matters is the CFM rating at the pressure you intend to use.

On the HP ratings for example: I have a small compressor on wheels that they advertise as a 5HP motor but it has a 120 volt 15 amp plug (standard plug). 5HP equals 3728 Watts. 3728 Watts at 120 volts is 31 Amps. The unit runs fine on a 15 amp circuit so the absolute most it could be is 2.5 HP and more likely closer to 2 HP.