<P> The hydraulic analogy to Ohm's law has been used, for example, to approximate blood flow through the circulatory system . </P> <P> In circuit analysis, three equivalent expressions of Ohm's law are used interchangeably: </P> <Dl> <Dd> I = V R or V = I R or R = V I . (\ displaystyle I = (\ frac (V) (R)) \ quad (\ text (or)) \ quad V = IR \ quad (\ text (or)) \ quad R = (\ frac (V) (I)).) </Dd> </Dl> <Dd> I = V R or V = I R or R = V I . (\ displaystyle I = (\ frac (V) (R)) \ quad (\ text (or)) \ quad V = IR \ quad (\ text (or)) \ quad R = (\ frac (V) (I)).) </Dd>

Ohm's law states that current is given by the ratio of voltage/resistance