circuit. Describe how changing the number or Exploring: Models of circuits type of components in a circuit affects Provide a model to explain how the current. electrical circuits work (e.g. lorries Describe how current and voltage collecting, transporting and behave in series and parallel circuits. depositing material; repeat). Ask Securing students which part of the model Describe how voltage and energy are represents parts of a circuit. linked. Describe a current as a flow of Explaining: Switches electrons. Show students examples of different Exceeding types of switch. Demonstrate the Describe the relationship between switches, and elicit ideas about how watts and joules/second. they work and what they can be used Use the formula relating power, for. current and voltage. Plenary: Thinking about current electricity Odd One Out: atom, electron, nucleus. (Possible answers: atom, as the other two are parts of an atom; atom, as it normally has no charge whereas electrons and nuclei have charges; electron – the only particle that can move through a material.) Lesson 9Jd: Resistance Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Variable resistors Explaining: A Resources n/a Show students State what is meant by resistance and Show students a rheostat connected model for from 9Jd a rheostat name its units. in series in a circuit with a bulb. Show resistance Exploring connected in Describe the relationship between the effect on brightness of moving Students can Science. series in resistance and current. the slider and ask them to suggest discuss how the a circuit with a Describe how the resistance of a wire how the rheostat works, revising model could be bulb. varies with length and thickness. ideas about resistance. changed to Use the formula relating voltage, represent a wire Students
circuit. Describe how changing the number or type of components in a circuit affects the current. Describe how current and voltage behave in series and parallel circuits. Securing Describe how voltage and energy are linked. Describe a current as a flow of electrons. Exceeding Describe the relationship between watts and joules/second. Use the formula relating power, current and voltage. Exploring: Models of circuits Provide a model to explain how electrical circuits work (e.g. lorries collecting, transporting and depositing material; repeat). Ask students which part of the model represents parts of a circuit. Explaining: Switches Show students examples of different types of switch. Demonstrate the switches, and elicit ideas about how they work and what they can be used for. Plenary: Thinking about current electricity Odd One Out: atom, electron, nucleus. (Possible answers: atom, as the other two are parts of an atom; atom, as it normally has no charge whereas electrons and nuclei have charges; electron – the only particle that can move through a material.) Lesson 9Jd: Resistance Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing State what is meant by resistance and name its units. Describe the relationship between resistance and current. Describe how the resistance of a wire varies with length and thickness. Use the formula relating voltage, Starter: Variable resistors 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, revising ideas about resistance. Explaining: A model for resistance Students can discuss how the model could be changed to represent a wire Resources from 9Jd Exploring Science. n/a Show students a rheostat connected in series in a circuit with a bulb. Students
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