We aren't going to build an electric generator to provide your house with electricity. Rather, we'll build a small experimental generator. The same principles apply for a large and small generator.
Electric generators can be called energy converters, as they convert heat energy or kinetic energy (energy from motion) into electrical energy. The theory behind an electric generator is that the variation of a magnetic field produces an electric current through a wire loop. It's fairly easy to build an electric generator. Just follow these instructions.
Add: Building 3, Yingshuo science park, Wenming road, New Yang Gonglang village, Qiaotou town, Dongguan city, Guangdong Province,China