Electricity: 

• List the main renewable and non-renewable energy resources and define what a renewable energy resource is
• Compare ways that different energy resources are used, including uses in transport, electricity generation and heating
• Explain why some energy resources are more reliable than others, explaining patterns and trends in their use
• Evaluate the use of different energy resources, taking into account any ethical and environmental issues which may arise
• Justify the use of energy resources, with reference to both environmental issues and the limitations imposed by political, social, ethical or economic considerations
• Explain the difference between direct and alternating voltage and current, stating what UK mains is
• Identify and describe the function of each wire in a three-core cable connected to the mains
• State that the potential difference between the live wire and earth (0 V) is about 230 V and that both neutral wires and our bodies are at, or close to, earth potential (0 V)
• Explain that a live wire may be dangerous even when a switch in the mains circuit is open by explaining the danger of providing any connection between the live wire and earth
• Explain how the power transfer in any circuit device is related to the potential difference across it and the current through it
• Calculate power by recalling and applying the equations: [ P = VI ] and [ P = I2 R ]
• Calculate and explain the amount of energy transferred by electrical work by recalling and applying the equations: [ E = Pt ] and [ E = QV ]
• Explain how the power of a circuit device is related to the potential difference across it, the current through it and the energy transferred over a given time.
• Describe, with examples, the relationship between the power ratings for domestic electrical appliances and the changes in stored energy when they are in use
• Identify the National Grid as a system of cables and transformers linking power stations to consumers
• Explain why the National Grid system is an efficient way to transfer energy, with reference to change in potential difference reducing current