Rydal Hall has had a water-powered generator for decades. The water uphill has gravitational potential energy. As it falls through pipes, the gravitational potential energy turns into kinetic energy. This energy is transferred from the water to a turbine. The turbine turns a generator. The generator transfers the kinetic energy into electrical energy. During every energy transfer, some energy is dissipated as thermal energy to the surroundings due to friction. It is friction between the water and the pipe walls at first. Then it is friction between the moving parts of the turbine and generator. It is always important to say where the friction acts. There is further important information about the turbine in the notice in the photograph.
