How Do Overshot and Undershot Water Wheel Make Electricity?

Define problem

How do overshot and undershot water wheel make electricity? Overshot and undershot generator is use electricity and they use other motor. How does water wheel get their energy from? Water wheel get their energy from the worldwide for a long time to generate huge amounts of electricity from water stored behind massive dams. Small scale hydropower generators are usually used without a damn. How does dirty water change into freshwater? Dirty water change into fresh water because they go through the water turbine and make fresh water out of it. Why do people drink dirty water instead of fresh water?

People don't drink dirty water because it kills five thousand children in a day, if they drink the fresh water they will survive.

Research Waterwheel, mechanical device for tapping the energy of running or falling water by means of a set of paddles mounted around a wheel. The force of the moving water is exerted against the paddles, and the consequent rotation of the wheel is transmitted to machinery via the shaft of the wheel. The waterwheel was perhaps the earliest source of mechanical energy to replace that of humans and animals, and it was first exploited for such tasks as raising water, fulling cloth, and grinding grain. A brief treatment of waterwheels follows.

Specify requirement Overshot wheel has a maximum efficiency is 70% of potential energy. Overshot has 70% of potential energy it means the water wheel goes backward and pick up to 70% of water. Undershot wheel has a maximum efficiency is 20% of potential energy. Undershot has 20% of potential energy it means the water wheel goes forward and pick up to