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Ohm's law is applicable to any circuit, be it DC or be it AC.

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Ohm's Law is applicable to all linear or ohmiccircuits, regardless of whether they are d.c. or a.c. A linear or ohmic circuit is one in which the ratio of voltage to current is constant for variations in voltage. Ohm's Law does not apply to non-linear or non-ohmic circuits (e.g. tungsten, electronic devices such as diodes, and electrolytes).

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