Energy is the ability or capacity to do work. It can be in various forms, such as mechanical energy, electrical energy, thermal energy, or chemical energy. Energy is what makes things happen—whether it’s moving an object, heating something up, or powering devices.
The SI (International System of Units) unit of energy is the
Joule (J). One joule is the amount of energy transferred when a force of one newton is applied to move an object one meter in the direction of the force.
Mathematically:
\[
1 \, \text{J} = 1 \, \text{N} \times 1 \, \text{m}
\]
where:
- N is newton (unit of force)
- m is meter (unit of distance)
So, when you apply one newton of force to move something one meter, you use one joule of energy.