If the world lost all of it's electricity, from a single button.

All factories would immediately stop production. At night, the landscape will suddenly turn completely black. If there is a moon visible in the sky, it won't help much. All household appliances, the internet, the street lights, all inaccessable, maybe forever. The only news around is on newspapers in the street. And even then, you would have to guess what is happening in your street daily. No-one would have knowledge of events in other countries, unless they read it when the internet was around. All resources around will be limited, it is now nearly impossible to produce more without it being home-made. This includes food. Crafty people will form large gangs to capture supermarkets and stores. People will run to the supermarkets for food, and a gang will have control over it. Diamonds will be worthless, all it will be is a shiny rock. Solar panels will be worth a fortune, as they only need sunlight to make electricity. You will form a gang or go alone and raid the local areas, hoarding resources. Supermarkets, Petrol Stations, Factories, Warehouses. You will then protect these areas as much as you can. If you have too much food, you hire a new member to eat, and he will protect the warehouse. Money will lose it's popularity, as money itself cannot be used as food or anything - it is paper. When you can't write, you will have money as an option to write on. If you hoard money, your money is just "paper". Swapping will be the preferred currency, and favours/work. These gangs will be based on owning resources, and not crime. But crime will be common as you could always just steal other people's stuff, and there is no cops around - but people themselves will hunt you down to get their stuff. All politicians and presidents will be unable to do anything, they cannot know all the events around the country, and cannot make laws because communication is limited. Painting a huge sign is the most you could do to tell the public about the laws. Sending government officials all around the country to enfore laws is useless - there is no prison system. "If someone harms you, you must fight them back" will be the universal way of justice.