angreal and sa'angreal

So I've always had a question, we all know what angreal and sa'angreal do, but I don't think it ever goes into detail about how they work. I imagine channelers as wells that hold the power, wells that refill. If you draw water faster than can be refilled you burn out or die. I think of it as adding room to the well and making it fill up faster. So say Rand's 'well' is 30 feet deep. Adding Callendor extends it to 45 feet deep, able to hold more, and it refills faster. Maybe the Choedan Kal increses it to like 100 feet deep.