From sources to lighting of a bulb
The process of generating and utilizing electricity is complicated. First, the power station mainly uses thermal sources like coal, natural gas, biomass, Element U and so on to create electricity. Then, using the power wire, electricity is transformed from the power station to the transit station. The transit station use transformer to lower the pressure of electricity from the grid to each family. In each family, as long as you turn on the brake knife, you can split on the switch. The bulb is lighting then!