Question

how to define joule​

Answer 1

One joule is the amount of work done by applying a force of one newton on a body to displace it by a distance of one metre!

Answer 2

A joule is defined as the amount of energy transferred to an object when a force of one newton acts on the object in the direction of its motion through a distance of one meter (1 newton meter or Nm). ... One BTU is equal to approximately 1,055 joules. One joule is equal to: 1 × 107 erg (exactly)