What does Ohm's law express in relation to current?

Ohm's law is a fundamental principle in electrical engineering that relates voltage (E), current (I), and resistance (R) in an electrical circuit. The correct expression, which is I = E / R, indicates that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor.

This relationship underscores that if you increase the voltage, while keeping the resistance constant, the current will increase. Conversely, if the resistance increases while maintaining the same voltage, the current will decrease. This linear relationship helps in understanding how electrical components behave in a circuit and is essential for circuit analysis and design.

Other formulas presented in the choices do not correctly express the relationship defined by Ohm's law. They either misrepresent the relationship by suggesting incorrect algebraic manipulations or combinations of the voltage, current, and resistance. Understanding this expression is crucial for analyzing and designing electrical circuits effectively.