1. The problem statement, all variables and given/known data A voltage source e(t) = 50 sin(2000t + 30°) V supplies the current i(t) = 0.5 cos(2000t) A in a circuit. Find the impedance in the circuit, in both polar and rectangular form. Is the circuit inductive or capacitive? 2. Relevant equations 3. The attempt at a solution I have a problem here, right of the bat I'm not used to seeing voltage and current being given as an expression including time. Well, in AC circuits, that is. I've looked through my book, but I can't find any examples on this. There isn't much work to show here as I'm confused as to where I should start. I RMS involved? I picture a sinus wave with current and voltage waves, that's where that idea came from. Any input, at all, would be greatly appreciated.