Are Ohm's law and Kirchhoff's law applicable to AC circuits?

Yes, if you properly examine all the resistances and reactances, taking into account phase of currents and voltages. Not just of the components, but parasitic and distributed parameters. read more

Together, Kirchhoff’s Voltage and Current Laws are a formidable pair of tools useful in analyzing electric circuits. Their usefulness will become all the more apparent in a later chapter (“Network Analysis”), but suffice it to say that these Laws deserve to be memorized by the electronics student every bit as much as Ohm’s Law. read more

Summary – Ohm’s Law vs Kirchhoff’s Law. Ohm’s and Kirchhoff’s Laws are two fundamental theories in electrical circuit analysis. They describe the properties and relationship of voltage and current in a single conductive element and a branch of electrical circuit respectively. While Ohm’s Law is applicable to a resistive element, Kirchhoff’s Laws are applied to a series of elements. read more