A remote medical store needs a continuous supply of electricity. The proposed supply consists entirely of solar cells. Which property of this supply creates the greatest difficulty in meeting the store's requirement?
Their output is greatest during short winter days.
Their output falls when the air is not moving.
Their output falls to zero during hours of darkness.
They must shut down when the sunlight becomes very strong.
86 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.