A domestic solar array converts 18% of the solar energy it receives into useful electrical energy.
Calculate the total solar energy that must fall on the solar array to produce 5.4 MJ5.4\text{ MJ}5.4 MJ of electrical energy.
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.