ability vs wattage

ability

noun
  • Physical power. 

  • A unique power of the mind; a faculty. 

  • A skill or competence in doing; mental power; talent; aptitude. 

  • The quality or state of being able; capacity to do or of doing something; having the necessary power. 

  • The legal wherewithal to act. 

wattage

noun
  • An amount or power (especially electric), expressed in watts, kilowatts etc. 

  • The power requirement of some electric appliance. 

How often have the words ability and wattage occurred in a corpus of books? (source: Google Ngram Viewer )