The Clue 1 Horsepower = 745.7 ___
The Answer WATTS
The clue states that 1 horsepower is equal to 745.7 of something. In this case, that "something" is watts, which are a unit of power. This means that when you convert horsepower to watts, you get a value of 745.7 watts. Therefore, the answer "watts" fits perfectly with the clue provided.