Question

Si unit of potential energy?

Answer 1

Please understand that the SI unit for potential energy is the same as the SI unit for all energy, the Joule.

The Joule in SI base units is defined as:

`J =(kg*m^2)/s^2`

Please consider the equation for kinetic energy.

`K.E. = 1/2mV^2`

The units for `V` is `m/s`

Square that `m^2/s^2`

Multiply by the units for mass:

`(kg*m^2)/s^2`

Let's consider Gravitational potetial energy:

`P.E. = mgh`

The units for `m` is `kg`:

`P.E. = kggh`

The units for `g` is `m/s^2`:

`P.E. = kgm/s^2h`

The units for `h` is `m`:

`P.E. = (kg*m^2)/s^2`

Lets look at `E = mC^2`

The units for `m` is `kg`:

`E = kgC^2`

The units for `C` is `m/s` square it `m^2/s^2`

`E = (kg*m^2)/s^2`

I hope that this helps you to understand that the SI unit for all types of energy is, the Joule.