well wallyphio, the sudden change would affect many that rely completely on electricity, and most are unhealthy, and arn't used to surviving without the luxurys the electricity gives, and just couldn't adapt
True we probably would go back to survival of the fittest but would we really have to? We could just go back to an age where electricity wasn't there. They still had cars without electricty. Hundreds would die becuase life-support and such things would go out and many medical practises would be non-existent but we would survive and reboot the electricity in a matter of days. So nucelar cores wouldn't overload.
Well if electricty was gone this site would have never existed either would have TV or game consoles so it would make a big difference if electricty was gone.
The first to be affected will be the hospitalized people and people who need electricity to live. Soon after, those who are too reliant on electricity will die off, the only ones who will be left are the survivors, and the people who have no direct use for electricity.