If the resistor is called R1 in a circuit with index 'cir' you can get the voltage and current, as cir.R1_v and cir.R1_i, respectively.

René Christensen

thanks alot christensen, i try to simulate a capacitor based energy harvester by comsol multiphysics 5.5.

i draw 2 plates and give a 10 dc volt to upper plate but when it moves sinusoidally its voltage also changes with respect of excitation

I imagine you do a time-integration then to find the power, although I am not too deep into transient analyses of your type.