Energy Resources and the National Grid

Describe the primary energy resources available on Earth, including fossil fuels, nuclear fuel, biofuel, wind, hydroelectricity, tides, and the Sun.
Explain the fundamental differences between renewable and non-renewable energy resources.
Compare the various ways in which main energy resources are utilized to generate electricity.
Recall the characteristics of the UK domestic mains supply, specifically that it is alternating current at 50Hz and approximately 230 volts.
Explain the difference between direct and alternating voltage.
Recall that the National Grid uses transformers so that electrical power is transferred from power stations to the network at high voltages, and then at lower voltages for use in homes.
Differentiate the functions of the live, neutral, and earth mains wires, and recall the potential differences between them.
Explain the danger of a live wire even when a mains circuit switch is open, and the hazards of connecting a live wire to any earthed object.
Analyze patterns and trends in the use of energy resources across domestic, workplace, and national contexts.

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