How heavy is a 20 amp motor and what is it rated at in horsepower?
Motors tend to have nameplates that give you the HP. This will be the output power. You have given an input current but not even mentioned the voltage. With the voltage and current, you could estimate the output if you guess at the efficiency.
For typical 115 volt single phase AC motors, a 1 Hp motor would require 16 amps and a 1-1/2 Hp motor would require 20 amps. A 230 volt 3 Hp motor would typically require 17 amps. With a simple ventilated, rolled steel housing, a 1 Hp motor would weigh about 40 pounds and a 1-1/2 Hp motor would weigh about 45 pounds. Cast iron motors and motors that run at 1200 RPM or less would be heavier.
