ability vs electric potential

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. 

electric potential

noun
  • The potential energy per unit charge at a point in a static electric field. 

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