In which situation is an Ohm's law most applicable?

Ohm's Law is most applicable in resistive circuits due to its foundational principle, which states the relationship between voltage (V), current (I), and resistance (R) as V = I × R. This law holds true as long as the resistance remains constant and does not depend on external factors like frequency or reactive components.

In resistive circuits, the current through the resistor is directly proportional to the voltage across it. This means that any change in voltage results in a predictable change in current, maintaining a linear relationship that makes calculations straightforward and reliable.

In other types of circuits, such as those with capacitance or inductance, the behavior is more complex due to the effects of reactance and phase differences between voltage and current. For example, capacitive circuits can store energy and may lead to non-linear results, while inductive circuits involve magnetic fields that can cause delays and phase shifts in the current relative to the voltage. As such, these circuits do not follow Ohm's Law in the same straightforward manner, making resistive circuits the ideal application for this fundamental law.