I am guessing that the one with the household plug is supposed to be low voltage and the red spark high voltage, but they are flipped for me so low voltage is the red sparkle and household plug is high voltage.

Different icons might help, but they are what came with the original mod. :)
I think they are supposed to represent source and load. I guess the way to think about it is, you plug the yellow power cord into the power source and it then supplies via the red electric bolt.

Yeah but my point is that the yellow left side (refering to the thumbnail up top) is called high voltage and the right one low voltage. Wich means (how it is now) that you are using low voltage to transfer power with the large power poles, which is the opposite how it is IRL. Yes i know that there doesnt exist any voltage in the game but it screws up my brain that i have to think backwards all the time. :P