Ohm's law is applicable to _.

Explanation

The correct answer is C: Carbon resistors. Ohm's Law, which states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, applies to devices with a constant resistance. Carbon resistors fit this criterion because they are linear and maintain a constant resistance under normal conditions.Semiconductors and vacuum tubes, on the other hand, are nonlinear components. Their resistance can vary with changing current or voltage, which means they do not consistently adhere to Ohm's Law, rendering options A and B incorrect.Option D is incorrect because it contradicts the fact that carbon resistors do comply with Ohm's Law.