Describe the relationship between resistance and current. Explaining: Lorry model for Describe how the resistance of a wire measuring electricity varies with its length and thickness. Use a lorry model to help students to Explain how a variable resistor works. think about how ammeters and Exceeding voltmeters work. Discuss what the Use a model to explain the idea of various parts represent and how voltage. useful the model is. Describe how voltage and energy are linked. Plenary: Thinking skills Explain why a voltmeter is connected Consider All Possibilities: the current in parallel. in a circuit is very low. (Possible answers: there are lots of components in the circuit; the connecting wires are very thin; there is only one cell in the circuit; most of the chemicals in the cell have been used up.) Lesson 7Je: Using electricity Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Heating effect of current Starter: Heating Resources n/a Demonstrate Recall some dangers of electricity. Demonstrate the heating effect of a effect of current from 7Je the heating Recall some safety precautions to be current, by holding a length of Extend the Exploring effect of a followed when using electricity. nichrome wire between two clamp demonstration to Science. current, by Identify electrical hazards in a stands and making it part of a circuit. show how fuses holding a length scenario. When the wire has been warmed up it work. of nichrome Describe the job that fuses do. can be used to cut paper. wire between Recall how the different wires are Exploring: two clamp connected in a plug. Exploring: Testing fuse wire Testing fuse wire stands and Securing Provide students with lengths of fuse Encourage making it part Explain why electricity is more wire of different ratings and ask them students to of a circuit. convenient than other sources of to find out the maximum current for consider the energy, and classify some of its uses. each wire. inherent Students use Explain some safety precautions to be inaccuracy of lengths of fuse followed when using electricity. Explaining: Wiring plugs attempting to wire of different
Describe the relationship between resistance and current. Describe how the resistance of a wire varies with its length and thickness. Explain how a variable resistor works. Exceeding Use a model to explain the idea of voltage. Describe how voltage and energy are linked. Explain why a voltmeter is connected in parallel. Explaining: Lorry model for measuring electricity Use a lorry model to help students to think about how ammeters and voltmeters work. Discuss what the various parts represent and how useful the model is. Plenary: Thinking skills Consider All Possibilities: the current in a circuit is very low. (Possible answers: there are lots of components in the circuit; the connecting wires are very thin; there is only one cell in the circuit; most of the chemicals in the cell have been used up.) Lesson 7Je: Using electricity Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall some dangers of electricity. Recall some safety precautions to be followed when using electricity. Identify electrical hazards in a scenario. Describe the job that fuses do. Recall how the different wires are connected in a plug. Securing Explain why electricity is more convenient than other sources of energy, and classify some of its uses. Explain some safety precautions to be followed when using electricity. Starter: Heating effect of current Demonstrate the heating effect of a current, by holding a length of nichrome wire between two clamp stands and making it part of a circuit. When the wire has been warmed up it can be used to cut paper. Exploring: Testing fuse wire Provide students with lengths of fuse wire of different ratings and ask them to find out the maximum current for each wire. Explaining: Wiring plugs Starter: Heating effect of current Extend the demonstration to show how fuses work. Exploring: Testing fuse wire Encourage students to consider the inherent inaccuracy of attempting to Resources from 7Je Exploring Science. n/a Demonstrate the heating effect of a current, by holding a length of nichrome wire between two clamp stands and making it part of a circuit. Students use lengths of fuse wire of different
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