intensity vs wattage

intensity

noun
  • Time-averaged energy flux (the ratio of average power to the area through which the power "flows"); irradiance. 

  • Can mean any of radiant intensity, luminous intensity or irradiance. 

  • Synonym of radiance. 

  • The degree of strength. 

  • The quality of being intense. 

  • The severity of an earthquake in terms of its effects on the earth's surface, and buildings. The value depends on the distance from the epicentre, and is not to be confused with the magnitude. 

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 intensity and wattage occurred in a corpus of books? (source: Google Ngram Viewer )