Securing Ask students to build a series Construct a circuit from instructions circuit with one switch and two provided in the form of a circuit diagram. bulbs and then ask them if they Describe how changing the number or can use a second switch to turn type of components in a circuit affects the just one bulb on or off. current. Recall the differences between how Explaining: 7Jc Using tables current behaves in series and parallel Introduce the use of tables for circuits and describe and predict what the effective science communication current is like at different points in a and the idea of qualitative and series circuit and parallel circuit. quantitative data. Explain how switches can be used to control different parts of a parallel circuit. Plenary: Bridges in parallel Explain why the lights in a house are Show students a map or photo wired in parallel. showing the two bridges across the Analyse a given parallel circuit and say River Severn. Explain that the first which components will be on or off with bridge was opened in 1966 but by different combinations of switches closed. 1990 there were severe traffic Recall the link between current and bulb jams, so the Second Severn brightness. Crossing was opened in 1996. Ask Exceeding students to suggest how this is a Use their knowledge of switches and model for a parallel circuit and to parallel circuits to devise circuits for point out what characteristics of a specified purposes. circuit it can and cannot represent. Lesson 7Jd: Voltage and resistance Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Variable resistor Exploring: Length Resources n/a Students State what is meant by: voltage, Show students a rheostat connected of wire and from 7Jd investigate the resistance. in series in a circuit with a bulb. Show resistance Exploring effect of the State the units for voltage. the effect on brightness of moving Students can plot Science. length of a wire Describe how a voltmeter is used. the slider and ask them to suggest a scatter graph on its resistance Recall how the current changes when how the rheostat works. A display and a line of best (measured only the voltage of the supply changes. ammeter can help to reinforce the fit to show their in terms of the Securing link between size of current and results. size of the
Securing Construct a circuit from instructions provided in the form of a circuit diagram. Describe how changing the number or type of components in a circuit affects the current. Recall the differences between how current behaves in series and parallel circuits and describe and predict what the current is like at different points in a series circuit and parallel circuit. Explain how switches can be used to control different parts of a parallel circuit. Explain why the lights in a house are wired in parallel. Analyse a given parallel circuit and say which components will be on or off with different combinations of switches closed. Recall the link between current and bulb brightness. Exceeding Use their knowledge of switches and parallel circuits to devise circuits for specified purposes. Ask students to build a series circuit with one switch and two bulbs and then ask them if they can use a second switch to turn just one bulb on or off. Explaining: 7Jc Using tables Introduce the use of tables for effective science communication and the idea of qualitative and quantitative data. Plenary: Bridges in parallel Show students a map or photo showing the two bridges across the River Severn. Explain that the first bridge was opened in 1966 but by 1990 there were severe traffic jams, so the Second Severn Crossing was opened in 1996. Ask students to suggest how this is a model for a parallel circuit and to point out what characteristics of a circuit it can and cannot represent. Lesson 7Jd: Voltage and resistance Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing State what is meant by: voltage, resistance. State the units for voltage. Describe how a voltmeter is used. Recall how the current changes when the voltage of the supply changes. Securing Starter: Variable resistor Show students a rheostat connected in series in a circuit with a bulb. Show the effect on brightness of moving the slider and ask them to suggest how the rheostat works. A display ammeter can help to reinforce the link between size of current and Exploring: Length of wire and resistance Students can plot a scatter graph and a line of best fit to show their results. Resources from 7Jd Exploring Science. n/a Students investigate the effect of the length of a wire on its resistance (measured only in terms of the size of the
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