I'll preface this thread with 2 items: I don't know much of anything about electricity and I don't have any opinions about power cables at this stage in the game. Now, on to the question. . .

In layman's terms, how is adding a better power cord supposed to improve the sound of your system?

I've heard reasoning referring to both the 'quality' of the power coming in as well as the 'amount,' but like I said, I don't really understand the whole thing all that well. Any guidance would be appreciated.