Ohm's law is fundamental in electrical theory and applies broadly, including to transformers. However, transformers also involve additional principles due to their inductive nature, requiring consideration of reactance (X sub L). While Ohm's law can be used in transformer calculations, it is not the sole governing principle. Understanding both Ohm's law and the specific equations related to transformers is essential for accurate analysis. Overall, Ohm's law is relevant, but it must be applied alongside other transformer-specific equations.