You can use the PhET simulation software which can be downloaded from If you do not have sufficient equipment to allow all the learners to make all the circuits or you want to experiment with simulations, you can use the PhET simulation for building an electric circuit. This shows that the colour coding is arbitrary. In order to avoid this misconception, sometimes red wires can be used to connect the negative side of the battery to the negative side of the meters, or sometimes only use one colour of wire. This happens because of the colour coding often used on electrical meters to indicate polarity. When building a real circuit from a diagram, the real circuit will not look exactly the same as the diagram.Ī common misconception which develops in circuit building is that black wires carry negative current and red wires carry positive current. It is important to remind learners that circuit diagrams are just schematics of a circuit. This was first introduced in primary school, so learners should be familiar with the circuit diagram symbols, however, some revision might be necessary. In Grade 8, learners will practice drawing electrical circuits using the correct circuit symbols. In Grade 7, learners investigated basic circuits, as well as energy transfers within a system. This chapter builds on the work done in Grade 7.
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