A coastal emergency radio transmitter must have electricity at all times. Engineers propose that a tidal generator should be its only supply. Which fact creates the greatest difficulty for this proposal?
The generator output falls whenever the weather is calm.
The generator can operate only during daylight hours.
The electrical output is interrupted whenever the tide turns.
The times at which the tides turn cannot be forecast.
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.