Essential idea: The constant need for new energy sources implies decisions that may have a serious effect on the environment. The finite quantity of fossil fuels and their implication in global warming has led to the development of alternative sources of energy. This continues to be an area of rapidly changing technological innovation.
Understandings: Specific energy and energy density of fuel sources, Sankey diagrams, Primary energy sources, Electricity as a secondary and versatile form of energy, Renewable and non-renewable energy sources
Applications and skill: Solving specific energy and energy density problems, Sketching and interpreting Sankey diagrams, Describing the basic features of fossil fuel power stations, nuclear power stations, wind generators, pumped storage hydroelectric systems and solar power cells, Solving problems relevant to energy transformations in the context of these generating systems
Guidance: Specific energy has units of J kg^–1; energy density has units of J m^–3, The description of the basic features of nuclear power stations must include the use of control rods, moderators and heat exchangers, Derivation of the wind generator equation is not required but an awareness of relevant assumptions and limitations is required, Students are expected to be aware of new and developing technologies which may become important during the life of this guide
Data booklet: Power = energy / time, Power = 1/2 A ρ v^3