The mean electrical power output of a community micro-hydroelectric generator is 1.8 MW1.8\text{ MW}1.8 MW, which is distributed equally among 150015001500 smart-homes in an eco-village.
Calculate the mean power supplied to each smart-home. Give your answer in watts (W\text{W}W).
Some of the kinetic energy of the flowing water is dissipated as thermal energy due to fluid friction against the pipe walls (penstock) and mechanical friction in the turbine bearings. The interior walls of the penstock are treated with a hydrophobic, ultra-smooth polymer coating. Explain how applying this coating affects the efficiency of the hydroelectric generator.
Practise AQA GCSE Physics Conservation and dissipation of energy with exam-style questions for Foundation and Higher tier. 29 questions covering Energy transfers in a system and Efficiency, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.