Again, for a capacitor, one gets that i ( t ) = C d v ( t ) / d t = j ω ω C v ( t ) , and hence Z C ( ω ω ) = 1 / j ω ω C . The phasor domain is sometimes dubbed the frequency domain, although it lacks one of the dimensions of the Laplace parameter. For steady-state AC, the polar form of the complex impedance relates the amplitude and phase of the voltage and current. In particular: