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Answer for the clue "V = IR ", 9 letters:
ohm's law

Word definitions for ohm's law in dictionaries

Wikipedia Word definitions in Wikipedia
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance , one arrives at the usual mathematical equation that describes ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ohm \Ohm\ ([=o]m), n. [So called from the German electrician, G. S. Ohm.] (Elec.) The standard unit in the measure of electrical resistance, being the resistance of a circuit in which a potential difference of one volt produces a current of one amp['e]re. ...