What is the basic principle behind Ohm's Law?

The fundamental principle behind Ohm's Law is encapsulated in the relationship that voltage equals current multiplied by resistance. This law establishes that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with resistance (R) as the constant of proportionality.

This means that if you know the current flowing through a circuit and the resistance of the circuit, you can calculate the voltage. Mathematically, this is represented as V = I × R. Understanding this relationship is crucial for anyone working with electrical systems, as it allows for the calculation of one variable when the other two are known, enabling both design and troubleshooting of electrical circuits.

The other options misrepresent the relationships defined by Ohm's Law. For instance, power is related to voltage and current but does not form the basis of the law itself. Similarly, voltage cannot be accurately described as current divided by resistance, and resistance is not defined as the sum of voltage and current. Therefore, mastering the correct formulation enhances the ability to work effectively with electrical concepts and applications.