The steam turbine generators used today produce approximately 85% of the electricity in the United States. In a typical turbine, steam flows in at a speed near 100 miles per hour and at temperatures from 400 to 950 degrees Fahrenheit. This course describes the differences between an Impulse and Reaction turbine, why steam turbines are multi-staged, the different types of turbine blade compounding arrangements, or stages and how they relate to turbine efficiency.