I am not much of an electrical person but I'm trying to get an idea about it, so keep in mind I have very little background outside of college level electrical physics with calculus, and a strong basis in mathematical logic. I was learning about things you can make with logic gates and came across an adder. I like to give things a try before I look at the answer, so I came up with my own adder. The only difference between my adder and the one in the book I'm reading is that there's an OR gate at the end of their adder for the carry out wire, whereas I just put two wires together. It seems to me that putting two wires together is identical to an OR gate, as there is no electricity out of the node if there's no electricity in, and there is some electricity out of the node if there is some in from either or both sources.
My question is: What is the difference between putting two wires together and making a proper OR gate?
My guess is that it has something to do with the amount of electricity (current?) on the output wire from the 3-node/OR gate, but my understanding of circuits is a bit rusty. Thanks for your help!