Two countries each generate 300 TWh of electricity in one year. Country X uses 60% gas and 40% wind. Country Y uses 30% coal, 30% nuclear fuel and 40% wind. Coal releases about twice as much carbon dioxide per kWh as gas. Which country releases less carbon dioxide, and why?
X, because gas releases less carbon dioxide per kWh than coal.
X, because nuclear fuel releases carbon dioxide as it is used.
Y, because only 30% of its electricity comes from a fossil fuel.
Y, because nuclear fuel and wind both release no carbon dioxide.
40 exam-style questions on AQA GCSE Physics 1.3 National and global energy resources, covering 1.3 National and global energy resources. Each one has a worked solution and a mark scheme showing where the marks go.