Electricity can be generated using a micro-hydroelectric system in a mountain stream.
Water spins a small turbine as it flows down a steep channel, converting gravitational potential energy into kinetic energy.
Calculate the minimum height that 15.0 kg of water must fall to gain 1176 J of kinetic energy.
Take gravitational field strength, g=9.8 N/kgg = 9.8\text{ N/kg}g=9.8 N/kg.
57 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.