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Transcript
Learning profile - iGCSE Physics Topic 2: Electricity Content use the following units: ampere (A), coulomb (C), joule (J), ohm (Ω), second (s), volt (V), watt (W) 2.2 recall the hazards of electricity including frayed cables, long cables, damaged plugs, water around sockets, and pushing metal objects into sockets 2.3 describe the uses of insulation, double insulation, earthing, fuses and circuit breakers in a range of domestic appliances 2.4 know some of the different ways in which electrical heating is used in a variety of domestic contexts 2.5 understand that a current in a resistor results in the electrical transfer of energy and an increase in temperature 2.6 recall and use the relationship P = I×V 2.7 use the relationship between energy transferred, current, voltage and time E = I × V × t 2.8 recall that mains electricity is alternating current (a.c.) and understand the difference between this and the direct current (d.c.) supplied by a cell or battery 2.9 explain why a series or parallel circuit is more appropriate for particular applications, including domestic lighting 2.10 understand that the current in a series circuit depends on the applied voltage and the number and nature of other components 2.11 describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how this can be 2.1 Needs developing Needs Secure consolidation investigated experimentally 2.12 describe the qualitative effect of 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 changing resistance on the current in a circuit describe the qualitative variation of resistance of LDRs with illumination and of thermistors with temperature recall and use the relationship between voltage, current and resistance: V = I × R understand that current is the rate of flow of charge recall and use the relationship between charge, current and time :Q=I×t recall that electric current in solid metallic conductors is a flow of negatively charged electrons recall that: • voltage is the energy transferred per unit charge passed • the volt is a joule per coulomb identify common materials which are electrical conductors or insulators, including metals and plastics recall that insulating materials can be charged by friction explain that positive and negative electrostatic charges are produced on materials by the loss and gain of electrons recall that there are forces of attraction between unlike charges and forces of repulsion between like charges explain electrostatic phenomena in terms of the movement of electrons recall the potential dangers of electrostatic charges, e.g. when fuelling aircraft and tankers recall some uses of electrostatic charges, e.g. in photocopiers and inkjet printers Bold = higher material