While a tiny fraction of the energy we use in our electrical devices comes from batteries, most of this energy comes from generators at power plants. These generators, which are coupled to turbines, take energy from the turbines and send an alternating current through transmission wires. The turbines, in turn, are powered by a flow. In coal-fired and power plants, the flow of steam delivers energy to the turbine. What is the main source of energy for electrical devices?
1) Batteries
2) Generators at power plants
3) Turbines
4) Transmission wires
