Maintenance Awareness Practice Test

In the context of the power law, the expression that can replace the variable E is the product of current (I) and resistance (R). This is based on the relationship defined by Ohm's Law, where E represents voltage or electric potential. According to Ohm's Law, the voltage (E) across a conductor is directly proportional to the current (I) flowing through it and the resistance (R) of that conductor.

Mathematically, this relationship is represented as:

E = I × R

This formula highlights how voltage arises as a result of the current passing through a resistance. When you increase the current or the resistance, the voltage will consequently increase, reflecting the direct proportionality described by the power law in relation to electric circuits.

Other expressions, while they contain the components of Ohm's Law, do not accurately represent the relationship where voltage is derived directly from current and resistance. Thus, the correct expression that replaces E in the context of the power law is indeed I × R.