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Transcript
Unit 4F Circuits and conductors Learning outcomes explain why devices in some circuits shown in drawings will work but devices in other circuits will not eg the switch is open so there is a break in the circuit and the bulb won’t light identify the purpose of components in a circuit record in simple terms the characteristics of devices using mains electricity eg they are large and powerful, they need a lot of electricity construct a circuit to test which materials let electricity pass through explain that with some materials the bulb did not light because the circuit was not complete make a generalisation about which materials did/did not conduct electricity eg metals let electricity pass, plastics did not, metals are good conductors of electricity and plastics are not explain that metals are used eg for cables and wires because they are good conductors and plastics eg for plugs because they are insulators Able outcomes use their knowledge and understanding to build a variety of circuits to light a bulb draw annotated diagrams of theses circuits produce a safety booklet reflecting their knowledge and understanding of the differences in power supplies and the dangers of electricity carry out an investigation into the insulating/conducting properties of a variety of materials, using results to form a conclusion devise an investigation to find out which metals are the best conductors of electricity make more detailed observations about which materials are better conductors of electricity Unit 4F Circuits and conductors Learning outcomes construct a circuit in which a switch turns a specific device on or off explain how their switch works describe what is likely to happen when extra or the wrong type of battery is added to a circuit eg it may be brighter but it may burn out describe how device and battery should be matched eg if it’s a 1.5 volt bulb it needs a 1.5 volt battery suggest a way of changing the brightness of a bulb and predict what will happen eg if we use two bulbs it won’t be as bright as with one; if we use two batteries the bulb will be brighter compare circuits fairly by changing one factor at a time make comparisons eg with two batteries the bulb is much brighter than with one but if we used three batteries the bulb might burn out; or when we used one bulb it was quite bright, with two bulbs it was dim and with three bulbs you could hardly see them and decide whether the prediction was right Able outcomes make a range of switches to complete a circuit evaluate each switch,explaining how it works and whether it could be improved build a number of circuits with components of varying voltage, ensuring that power supply and components are matched correctly devise a question to be investigated plan and carry out fair test investigation into changing brightness of bulb, loudness of buzzer or speed of motor make predictions and use the evidence collected to support their conclusions