How is Joule defined?
Joule is the unit of energy in the International System of Units (SI). It is named after the physicist James Prescott Joule. One joule is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter in the direction of the force. In other words, it is the work done when one watt of power is applied for one second.
If you want to calculate the joules for a given situation, you need to know the force applied and the distance over which it is applied. The formula to calculate joules is:
Energy (in joules) = Force (in newtons) x Distance (in meters)
For example, if a force of 10 newtons is applied over a distance of 5 meters, the energy transferred would be:
Energy = 10 N x 5 m = 50 joules