Which is not an application of Ohm's Law?

Ohm's Law forms the foundation for understanding the relationship between voltage (V), current (I), and resistance (R) in electrical circuits, expressed by the formula V = I × R. When considering the applications of Ohm's Law, troubleshooting circuits is a common practice where understanding these relationships helps identify problems in electrical systems. Sizing components, such as selecting appropriate resistors or circuit breakers, relies on calculations derived from Ohm's Law to ensure that components can handle the expected current without overheating or failing.

Creating multiple voltage levels, however, typically involves devices and techniques such as transformers or voltage regulators, which may not strictly adhere to the principles defined by Ohm's Law. Instead, these processes integrate other concepts in electrical engineering, such as power distribution and magnetic induction.

Given that all the listed applications, except for the creation of multiple voltage levels, directly relate to interpreting and applying Ohm's Law, selecting "None of the above" indicates an understanding that the first two applications are indeed applicable under Ohm's Law principles while recognizing that the third does not fit neatly within this framework.