Dictionary
Joule
1) Work done by the force of one neutron when its point of application moves through the distance of one meter in the direction of the force. 2) One watt-second.
The joule (symbol J, also called newton metre, or coulomb volt) is the SI unit of energy and work. The unit is pronounced to rhyme with "tool", and is named in honour of the physicist James Prescott Joule (1818-1889).
@@Joule = {1N \times 1m = 1 Newton \times 1 meter}@@
@@Joule = {1C \times 1V = 1 Coulomb \times 1 Volt}@@
@@Joule = {1W \times 1S = 1 Watt \times 1 Second}@@
One joule is the work required to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre or newton-metre (also with meter spelling), symbol N·m or N m. However, to avoid confusion the newton metre is usually used as a measure of torque, not energy.
Another way of visualizing the joule is the work required to lift a mass of about 102 g (e.g. a small apple) for one meter under the earth's gravity.
One joule is also the work required to move an electric charge of 1 coulomb through an electrical potential difference of 1 volt.
One joule is also the work done to produce power of one watt for one second, such as when somebody takes one second to lift the small apple mentioned above through one metre under the earth's gravity.