The SI unit of energy can be expresses as what?
The SI unit of energy is the Joule (J). To understand how this unit is derived, we need to look at the definition of energy. Energy is the ability to do work or transfer heat. In physics, work is defined as the product of force and displacement. Heat is a form of energy that can be transferred between objects due to a temperature difference.
The Joule is defined as 1 Newton-meter (N·m). A Newton (N) is the SI unit of force, and it is defined as the amount of force required to accelerate a one-kilogram mass at a rate of one meter per second squared (1 kg·m/s²).
So, to get the SI unit of energy, we multiply the SI unit of force (Newton) by the SI unit of distance (meter). This gives us the Joule, which represents the amount of energy transferred when a one Newton force is applied over a distance of one meter.
Therefore, the SI unit of energy can be expressed as the Joule (J).