Electricity Checklist trilogy
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AQA TRILOGY Physics Electricity
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TopicStudent Checklist
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6.2.1 Current, potential difference and resistance Draw and interpret circuit diagrams, including all common circuit symbols
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Define electric current as the rate of flow of electrical charge around a closed circuit
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Calculate charge and current by recalling and applying the formula: [ Q = It ]
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Explain that current is caused by a source of potential difference and it has the same value at any point in a single closed loop of a circuit
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Describe and apply the idea that the greater the resistance of a component, the smaller the current for a given potential difference (p.d.) across the component
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Calculate current, potential difference or resistance by recalling and applying the equation: [ V = IR ]
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Required practical 15: Use circuit diagrams to set up and check circuits to investigate the factors affecting the resistance of electrical circuits
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Define an ohmic conductor
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Explain the resistance of components such as lamps, diodes, thermistors and LDRs and sketch/interpret IV graphs of their characteristic electrical behaviour
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Explain how to measure the resistance of a component by drawing an appropriate circuit diagram using correct circuit symbols
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Required practical 16: use circuit diagrams to construct appropriate circuits to investigate the I–V characteristics of a variety of circuit elements
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6.2.2 Series and parallel circuits Show by calculation and explanation that components in series have the same current passing through them
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Show by calculation and explanation that components connected in parallel have the same the potential difference across each of them
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Calculate the total resistance of two components in series as the sum of the resistance of each component using the equation: [ R total = R1 + R2 ]
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Explain qualitatively why adding resistors in series increases the total resistance whilst adding resistors in parallel decreases the total resistance
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Solve problems for circuits which include resistors in series using the concept of equivalent resistance
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6.2.3 Domestic uses and safety Explain the difference between direct and alternating voltage and current, stating what UK mains is
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Identify and describe the function of each wire in a three-core cable connected to the mains
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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)
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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
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6.2.4 Energy transfers Explain how the power transfer in any circuit device is related to the potential difference across it and the current through it
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Calculate power by recalling and applying the equations: [ P = VI ] and [ P = I2 R ]
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Describe how appliances transfer energy to the kinetic energy of motors or the thermal energy of heating devices
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Calculate and explain the amount of energy transferred by electrical work by recalling and applying the equations: [ E = Pt ] and [ E = QV ]
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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.
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Describe, with examples, the relationship between the power ratings for domestic electrical appliances and the changes in stored energy when they are in use
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Identify the National Grid as a system of cables and transformers linking power stations to consumers
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Explain why the National Grid system is an efficient way to transfer energy, with reference to change in potential difference reducing current
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