Beside a teacher-prepared circuit sketch, a student says, “It reaches the bulb, so it’s complete.” The return connection has a deliberate gap, but don’t point it out immediately. Ask, “Where does the path go after the bulb, and can you follow it to the other cell terminal?” Their explanation will give you somewhere useful to go next.
Follow both connections
Label the cell terminals A and B, then trace the conducting path aloud:
cell terminal A → wire → first holder contact → through the bulb → second holder contact → return wire → terminal B
First, explain how the holder connects to the bulb’s separate contacts. Otherwise, a student may trace around the holder without accounting for the bulb itself.
The important feature is an uninterrupted conducting connection through the bulb between both cell terminals. The drawing doesn’t need to look like a circle or contain a fixed number of wires. The Primary Connections circuit lesson gives helpful background for this terminal-to-terminal reasoning.
The trace shows how the components connect, not how long charge takes to reach the bulb. Keep current and energy separate as well: the bulb doesn’t use up current. Electrical energy is transferred, while current is the rate at which charge flows. Energex’s Year 6 material explains that distinction in the simple series-circuit case.
Find where the path stops
Place the complete sketch beside the version with one gap in the return path. Ask the student to mark where the conducting path stops and explain what they expect.
They might say, “The return wire stops before the other terminal, so I predict the bulb won’t light.” In this single path, the gap creates an open circuit and interrupts the current. For the complete sketch, a careful prediction is that the bulb should light if the components are suitable, correctly connected and working.
A paper comparison supports reasoning and prediction, but it doesn’t show what real equipment will do.
Check what actually happens
If you follow the sketch with an adult demonstration, use adult-checked, school-approved low-voltage equipment and correctly rated components. Disconnect the cell before any authorised change, and make one change at a time. Don’t use mains electricity, button, coin or lithium cells, dismantled devices, short circuits, exposed live conductors or bare LEDs.
Write down whether the bulb lit beside the prediction. Keeping the two entries separate helps students compare what they expected with what actually happened. It also makes the limit of the drawing clear: a sketch can represent the intended connections, but it can’t establish that the equipment works.
If the intended connection is restored and the bulb remains dark, pause for an adult equipment check. Check the cell and bulb before deciding what went wrong. A depleted cell or defective bulb is possible, so darkness alone doesn’t prove that the student’s circuit reasoning was faulty. Changing one authorised feature at a time makes the evidence easier to interpret.
Respond to the explanation
This short conversation supports the Year 6 focus on circuit components, electrical energy and evidence-based conclusions described in the QCAA Year 6 Science alignment.
“Show me where the path stops, then explain what you predict.”