<Dd> τ = R C = 1 2 π f c (\ displaystyle \ tau = RC = (\ frac (1) (2 \ pi f_ (c)))) </Dd> <P> or, equivalently, </P> <Dl> <Dd> f c = 1 2 π R C = 1 2 π τ (\ displaystyle f_ (c) = (\ frac (1) (2 \ pi RC)) = (\ frac (1) (2 \ pi \ tau))) </Dd> </Dl> <Dd> f c = 1 2 π R C = 1 2 π τ (\ displaystyle f_ (c) = (\ frac (1) (2 \ pi RC)) = (\ frac (1) (2 \ pi \ tau))) </Dd>

Show that the product of resistance and capacitance (rc) has the units of time