[MrForbes]

In electronic circuits, the size of the conductor must be large enough to handle the current. And the insulation (or trace spacing) must be good enough to handle the voltage without arcing.

We look at current and voltage specs separately in most cases.

But power....watts...that is important because of the heat that must be dissipated.

It's not a matter of understanding the physics of Ohm's Law. It's a matter of understanding the engineering requirements for the different properties of electricity.