A Bendemeer parent considering Primary 5 Science tuition may hear a child say that any open switch makes every bulb go out. That rule fits a single unbroken loop being opened, but it can fail when a diagram contains separate branches. The difficulty is often tracing connections rather than remembering the word switch.
The weekday versus weekend question should make room for that tracing. A useful lesson asks which paths remain complete after a particular switch opens. A later changed description shows whether the child can follow the connections without relying on the original picture’s layout.
This guide uses illustrative paper circuits with a suitable working low-voltage source, working bulbs and sound connections, apart from the stated open switches. No wiring or home experiment is required. Match the examples to current school work and readiness, and confirm actual programme arrangements directly.
eduKateSG · Primary 5 Science · Bendemeer
Parallel circuit switches: identify which complete paths are interrupted
Find your next step
Choose a reading route below, or open the chapter index. Each route leads to two expanded chapters. The worked example and independent check use changed details to help you inspect understanding.
READING ROUTE 1 · CHAPTERS 1–2
Trace each complete path
Distinguish a branch switch from a shared connection.
READING ROUTE 2 · CHAPTERS 3–4
Read the worked case
Compare two switch positions, then consider a weekday lesson.
READING ROUTE 3 · CHAPTERS 5–6
Build a return routine
Consider a weekend window and repair the any-gap-means-all-off shortcut.
READING ROUTE 4 · CHAPTERS 7–8
Check changed branch labels
Trace fresh paths and inspect whether the explanation follows the connections.
READING ROUTE 5 · CHAPTERS 9–10
Plan the next step
Read the parent questions and prepare a circuit-path programme conversation.
Open the chapter index · Try the independent check · View the Primary 5 Science programme
Full chapter index
Chapters 1–5: understand, work through and compare lesson days
Chapters 6–10: repair, check and plan the next step
CHAPTER 1 OF 10 · Trace each complete path
1. Ask which path the child thinks was broken
Begin by asking your child to trace a complete path through each bulb and back to the source. If they stop as soon as they notice any open switch, they may be applying a single-loop shortcut to a branching circuit.
Keep the original explanation. ‘All bulbs go out because there is an open switch’ gives the teacher a precise reasoning target. The lesson can examine which connection the switch interrupts rather than simply rehearse the names series and parallel.
A diagram’s shape can distract from its connections. A branch drawn above another is not necessarily earlier in the circuit, and a switch appearing near a bulb is not enough to establish which path it controls. Trace the supplied wires.
CHAPTER 2 OF 10 · Trace each complete path
2. Treat each branch as a possible complete path
In a parallel arrangement, separate branches can provide complete paths between the source’s terminals. Oak National Academy’s parallel-loop explanation describes tracing each loop from one terminal to the other.
A switch placed only in one branch interrupts that branch when opened. Another branch can remain complete. A switch in a shared connection before the branches split is different: opening it can interrupt the paths through all the branches.
Keep the task focused on whether bulbs light. It supplies no exact current or brightness measurements. A complete-path explanation is sufficient; do not add a numerical change or promise identical brightness unless the actual question supplies the necessary model or evidence.
CHAPTER 3 OF 10 · Read the worked case
3. Trace a branch switch and a shared switch
Imagine a paper circuit described this way: one source terminal connects through shared switch K to junction J. From J, one branch passes through switch S and bulb A; another passes through bulb B without S. The branches rejoin at M, which connects to the other source terminal.
With K closed and S open, A’s branch is interrupted, so A does not light. B still has a complete path through K, J, B and M back to the source, so B lights under the stated working-component conditions.
If K is opened instead, both branch paths lose the shared connection to the source. Both bulbs go out, even if S is closed. The result depends on the switch’s electrical position, not merely on whether the word open appears in the question.
| Shared K | Branch S | Bulb A | Bulb B |
|---|---|---|---|
| Closed | Closed | Lights | Lights |
| Closed | Open | Does not light | Lights |
| Open | Closed | Does not light | Does not light |
CHAPTER 4 OF 10 · Read the worked case
4. Use weekday tuition when the route error is fresh
A weekday lesson may fit when the child has recently received feedback on a circuit question. Bring the diagram and ask them to trace the path they thought was broken. The teacher can then compare that path with the switch’s actual connections.
Consider attention after school. A focused pair of paths may work in a calm evening. If the child is too tired to follow junctions, adding a longer circuit may only encourage guesses from where components sit on the page.
Leave a later short check with different bulb letters and a new drawing arrangement. Ask which path remains complete before asking which bulb lights. Note whether the child needs an adult to point out the branch that avoids the open switch.
CHAPTER 5 OF 10 · Build a return routine
5. Use weekend tuition for an unhurried path comparison
A weekend session may suit a child who needs time to compare a branch switch with a shared switch. The teacher can keep the components similar while changing the connection interrupted, making the reason for the different outcomes explicit.
Use the available time to trace and explain, not merely to introduce larger circuits. A child who can label a parallel diagram may still predict that every gap stops every bulb. The route explanation should be checked alongside the terminology.
Plan a brief weekday return afterwards. Change which branch contains the open switch. The child should identify the interrupted path from the new description rather than remembering that bulb A was off in the worked example.
CHAPTER 6 OF 10 · Build a return routine
6. Repair the any-gap-means-all-off shortcut
If your child predicts that B goes out when S opens, ask whether B’s complete path passes through S. Give time to trace from one source terminal through B and back. This redirects attention without supplying the final lighting answer immediately.
Then ask why opening K has a wider effect. The answer should identify the shared connection used by both paths. That comparison prevents replacing the first shortcut with another one such as ‘parallel bulbs always stay on’.
Keep the written repair precise: ‘I checked for a gap anywhere instead of checking each bulb’s complete path.’ Revisit it with a changed circuit later. Repeatedly copying the word parallel may not alter how the child reads the connections.
CHAPTER 7 OF 10 · Check changed branch labels
7. Try a changed branch-switch description
The independent check below changes the bulb names and places the branch switch with the other bulb. Cover the worked case first. Ask your child to trace both paths and explain why the lighting results differ.
Check the explanation, not only the correct bulb letter. ‘The lower bulb always lights’ is not reliable because the drawing can be rearranged. The reason should refer to a complete path that does not pass through the open branch switch.
If prompting is needed, note the exact cue. That information helps the teacher distinguish difficulty locating junctions from misunderstanding a switch’s role. A fresh attempt after a gap is more useful than immediate repetition with the corrected route highlighted.
Independent check
A suitable working source supplies two parallel branches with sound connections and working bulbs. Branch 1 contains bulb P with no branch switch. Branch 2 contains switch T and bulb Q in the same branch. T is open, and the shared source connections are complete. Which bulb lights? Then a separate shared switch U, in a connection used by both paths before the split, is opened. What happens? Explain without making an exact brightness claim.
Checking notes
With only T open, P lights because its complete path does not pass through T. Q does not light because its branch is interrupted. Opening shared switch U interrupts both source-to-source paths, so neither bulb lights. The explanation concerns path completeness; no exact brightness change is supplied.
CHAPTER 8 OF 10 · Check changed branch labels
8. Review the rhythm through a newly arranged circuit
Use the planning table below alongside schoolwork, activities and rest. Both rhythms can support careful circuit tracing. The important conditions are enough attention to follow connections and another opportunity to do so without guided highlighting.
After a couple of learning weeks, inspect a changed description. Can your child explain both a branch-switch result and a shared-switch result? Can they avoid making brightness claims when the question asks only whether a bulb lights?
This guide does not establish a Bendemeer venue, available slot, journey time or price. Confirm arrangements directly. Choose the option that supports a sustainable explanation-and-return routine rather than assuming that one calendar label is inherently better.
| Learning need | Weekday possibility | Weekend possibility |
|---|---|---|
| Use feedback | Discuss a recently traced path | Bring the original diagram and reason |
| Compare switch positions | Focus on branch versus shared connection | Allow unhurried path-by-path tracing |
| Check transfer | Change bulb letters another day | Plan a short weekday return |
| Assess progress | Explanation follows connections | Apply the same standard to a redrawn circuit |
Does an open switch always stop every bulb? No. In the supplied parallel model, a switch opening only one branch leaves another complete branch available. A shared switch can interrupt both paths.
Can my child decide from the switch’s page position? No. Trace the electrical connections. A redrawn circuit can preserve the same paths while moving the symbols to different places.
Does this question establish exact brightness? No. The task concerns lighting and complete paths. It supplies no exact brightness data, and no home wiring is needed for the paper check.
CHAPTER 10 OF 10 · Plan the next step
10. Bring the interrupted path to the conversation
Bring the original diagram and a changed branch-switch answer to the tuition discussion. Include your child’s traced path and reason. Together, these can show whether the next step concerns junctions, shared connections or applying the complete-path idea independently.
In a 3-pax setting, each learner should trace and explain a bulb’s path before relying on the group. Discussion can reveal useful differences, but a shared correct lighting answer does not show that every child followed the connections.
See Primary 5 Science tuition for programme information. Use the eduKate Singapore enquiry page to discuss current work and family scheduling. Confirm arrangements directly and choose a rhythm with space for explanation and recall.
Chapter index ↑ · Previous chapter · Programme information →
For a wider comparison of lesson timing and recall, read the weekday versus weekend Science learning-rhythm guide.