horsepower vs tension

horsepower

noun
  • A nonmetric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts. 

  • Strength. 

  • Power derived from the motion of a horse. 

  • A metric unit (symbol often PS from the German abbreviation), approximately equal to 735.5 watts. 

tension

noun
  • Voltage. Usually only the terms low tension, high tension, and extra-high tension, and the abbreviations LT, HT, and EHT are used. They are not precisely defined; LT is normally a few volts, HT a few hundreds of volts, and EHT thousands of volts. 

  • The condition of being held in a state between two or more forces, which are acting in opposition to each other. 

  • State of an elastic object which is stretched in a way which increases its length. 

  • A feeling of nervousness, excitement, or fear that is created in a movie, book, etc.; suspense. 

  • Force transmitted through a rope, string, cable, or similar object (used with prepositions on, in, or of, e.g., "The tension in the cable is 1000 N", to convey that the same magnitude of force applies to objects attached to both ends). 

  • Psychological state of being tense. 

verb
  • To place an object in tension, to pull or place strain on. 

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