If all our electrical power sources suddenly and permanently went out and across the planet, our technology would significantly change, at least for the immediate future. Some areas of knowledge, like knowing how to build an electrical circuit or conventional computer, would be rendered useless because you'd simply have no way to power them. Your priorities would change as well. And when you think about it, how many people actually have basic survival knowledge for those 'desert island' type scenarios where modern conveniences are suddenly removed?