Could this be the real Global warming reason?

So i recently got rid of my electronics from my room and noticed a big difference in temperature. As in there were nights when I didn't need a fan during times I'd always need a fan. Could global warming be caused by the electricity we produce? If you look at the power grid it'd be heating up the Earth, unless i'm mistaken cause it causes heat to be going threw the earth and the heat gets transferred to the earth but even if that's not the case, what about all the technology we have now thats constantly producing heat since the typical person doesn't unplug them? I'm bad at researching and I'll admit that this is more of an instinct type of thing with the little bit I could understand of what I read.