If I have a simple RC network with a zero to plus 5 square wave as input, the voltage across the resistor in the network shown will step instantaneously (almost) to +5v and then fall slowly to ground at a rate dependent on the rc time constant of the network. For my network I am estimating that the resistor is about 10K and the capacitor is about 1 microfarad so the time constant is about 10 ms. My question is what happens if I use an electrolytic capacitor. Should the plus side connect to the signal source or the resistor? And, if it is connected in reverse what will happen assuming that the capacitor rating is 50v. I don't think it will go pop, but what happens over time? Does it develop an internal short, does it work but at a lower capacitance than expected? I dunno. Can anyone suggest what happens.