The correct answer is option 3 - Semiconductors. Ohm`s law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points. This means that in a conductor, the resistance remains constant regardless of the voltage or current applied.

In option 1, Ohm`s law does apply to AC (alternating current) circuits. Although the voltage and current values in an AC circuit continuously change, the relationship between voltage, current, and resistance still follows the principles of Ohm`s law.

In option 2, Ohm`s law applies to conductors. Conductors are materials that easily allow the flow of electric current, and Ohm`s law describes the relationship between voltage, current, and resistance in these materials.

In option 4, Ohm`s law still applies to conductors when there is a change in temperature. The resistance of a conductor tends to change with the change in temperature, but Ohm`s law can still be used to calculate the current or voltage in such situations.

Therefore, the only option where Ohm`s law does not apply is option 3 - Semiconductors. Semiconductors have a more complex behavior compared to conductors and do not always follow the simple relationship between