Here's a breakdown:

* I represents the fundamental dimension of electric current.

It's important to note that the dimensional formula of electric current doesn't involve the base units like length (L), mass (M), time (T), or temperature (Θ). This is because electric current is a fundamental quantity, meaning it's not derived from other quantities. It has its own unique dimension.

However, we can express electric current in terms of other fundamental quantities using its relationship with other physical quantities:

* Electric current (I) = Charge (Q) / Time (T)

Therefore, we can also express the dimensional formula of electric current as [Q/T], where:

* [Q] represents the dimension of charge.

* [T] represents the dimension of time.

So, while the fundamental dimension of electric current is [I], it can also be represented as [Q/T] based on its relationship with charge and time.