Watt is a measure of power consumption and relates directly to heat generated in the device. Amp is a measure of current. 1 Watt = 1 Volt x 1 Amp so it is the amp which does the heavy work while the watt is a measurement of the work. E=IR and P=IE From the physics text, etc. The volt is a measurement of the force pushing the amp, etc. The internets is also a fun term coined by ole Dubba.