Question

What is the unit of energy in the SI system?

Answer 1

In the SI (International System of Units), the unit of energy is the joule (J).

One joule is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter.

It can also be expressed as:

1. \( 1 \, \text{J} = 1 \, \text{kg} \cdot \text{m}^2 / \text{s}^2 \)
   

  (This comes from the formula for kinetic energy, \( KE = \frac{1}{2}mv^2 \), where \( m \) is mass and \( v \) is velocity).

So, the joule (J) is the standard unit of energy in the SI system.