A carbon-fibre flywheel energy storage system is used to stabilize electricity grids by storing kinetic energy during periods of low demand and releasing it when demand peaks.
Explain why the overall energy recovery efficiency of this flywheel system is less than 100%.
38 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.