What is the relationship expressed by Ohm's Law?

Ohm's Law defines the fundamental relationship between voltage, current, and resistance in an electrical circuit. This law states that the voltage across a conductor is directly proportional to the current flowing through it, provided the temperature remains constant. The mathematical expression of this relationship is given as voltage equals current multiplied by resistance.

This means that if you know any two of the three variables—voltage, current, or resistance—you can calculate the third. For example, if you have a specific voltage and you know the resistance of the circuit, you can determine how much current will flow through it.

The other options represent different formulas or relationships that do not accurately express Ohm's Law. For instance, the second option involves power, which is calculated differently. The third option incorrectly substitutes variables in a way that does not reflect the law's original formulation. The fourth option also misrepresents the relationship, as resistance cannot be expressed as a product of voltage and current. Thus, the correct expression of Ohm's Law is voltage equals current times resistance.