Respuesta :
					                   That ratio is the efficiency of whatever the power went into and came out of.  There's no reason the efficiency has to be expressed as a percentage.
					                
					                
					             
					                   The ratio of output power to input power, expressed as a percentage is B. efficiency. 
Efficiency is expressed as a percentage less than 100%, as a machine could never be completely efficient.
					                
					             Efficiency is expressed as a percentage less than 100%, as a machine could never be completely efficient.
