What happens when one bulb is removed from a circuit? The answer depends on how the bulbs are connected. In a simple series circuit, two bulbs share one continuous path. Removing one bulb opens that path, so the other bulb also goes off. In a parallel circuit, bulbs are on separate branches. Removing one bulb can leave the other branch complete, so the other bulb can stay on.
This is why ‘remove one bulb and all bulbs go off’ is not a universal rule. It is true for a one-path series arrangement but not for every branched circuit. Primary 5 Science students need to trace the circuit structure before predicting the effect.
At eduKate Sengkang, circuit-change questions are taught through before → change → final path. Students compare series and parallel arrangements, identify which bulb shares which path and explain why a branch can remain working after another branch is broken.
Use the Primary 5 Science Learning Hub, Why Does a Bulb Light Only in a Complete Circuit?, Which Switch Controls Which Bulb?, and the Circuit Paths and Fault Diagnosis guide.
- Up to three students per class.
- 1.5-hour weekly lesson.
- Focus: series circuits, parallel branches, bulb removal, open circuits, switch changes and explanation writing.
- Location: 83 Punggol Central, Singapore 828761.
- Enquiries: WhatsApp +65 8823 1234.
Series Circuit
A simple series circuit has one main conducting path through its components.
If one component is removed and leaves a gap, the only path is broken.
Students learn why one missing bulb can stop the whole loop.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Parallel Circuit
A parallel circuit has separate branches connected across the source.
One branch can be interrupted while another branch remains complete.
Students learn why removing one bulb may not stop another.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
One Path Versus More Than One Path
The most important difference is the number of complete paths available to the named bulb.
Picture shape is less important than connection structure.
Students trace routes rather than judge by visual layout.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Removing a Bulb
Taking a bulb out can create an open gap at its position.
Whether other bulbs go off depends on whether their paths also require that connection.
Students analyse the final circuit rather than use a memorised rule.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Replacing a Bulb
Putting the bulb back can restore the path if all other connections are correct.
A replacement bulb must also be working.
Students separate path repair from component condition.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Series Gap
A gap anywhere in the only series path interrupts all components on that path.
The gap does not need to be beside the battery or first bulb.
Students understand why circuit position does not create priority.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Parallel Branch Gap
A gap in one branch affects the path through that branch.
Other branches can remain complete if their shared supply and return connections are intact.
Students identify shared versus branch-specific connections.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Common Supply Connection
Parallel branches can share a wire before the split.
A gap in that shared wire can stop every branch.
Students learn that parallel does not mean every fault is isolated.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Common Return Connection
Branches can also share a return path to the battery.
An open common return can stop all bulbs.
Students trace both directions and shared endpoints.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Branch Switch
A switch inside one branch can control only that branch if no other path depends on it.
The effect follows connectivity, not how close the switch looks to a bulb.
Students connect switch-control and branch reasoning.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Master Switch
A switch placed before the branches can interrupt the shared path for every branch.
Closing a branch switch cannot overcome an open master switch.
Students combine shared and local conditions.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Equivalent Drawings
The same series or parallel circuit can be redrawn in different shapes.
Electrical behaviour remains the same when connections are unchanged.
Students recognise topology rather than memorised pictures.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Junctions
Junctions are points where paths split or join.
Identifying junctions makes branch reasoning easier.
Students mark split and join points before predicting changes.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Crossing Wires
Crossing lines are not always connected unless the diagram notation shows a junction.
Students follow dots or symbols rather than assume every crossing joins.
This prevents invented branches.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Bulb Contacts
A bulb removed from a holder leaves two connection points that are no longer joined through the bulb.
The gap is part of the electrical path.
Students understand why the holder alone does not complete the circuit.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Open Switch Versus Removed Bulb
Both can create an open path in the relevant branch.
The physical reason differs, but the circuit consequence can be similar.
Students compare mechanisms and effects.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Faulty Bulb Versus Removed Bulb
A failed bulb can interrupt its path even if it remains physically present.
The visible component does not guarantee electrical continuity.
Students use known working replacements for diagnosis.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Brightness Boundary
Removing a bulb can also change brightness in some circuit arrangements.
The first job is to decide which bulbs remain connected; brightness comes after on/off analysis.
Students avoid mixing two questions.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Battery Condition
A weak battery can make remaining bulbs dim even when their paths are complete.
Circuit structure and source condition are separate variables.
Students distinguish arrangement from component state.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Identical Bulbs
Comparisons are simpler when bulbs are identical and working.
Different bulb types can change brightness and behaviour.
Students control bulb type when testing arrangement effects.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Series Two Bulbs
Two identical bulbs are connected one after another in one loop.
Removing either bulb opens the loop and both are off.
Students see symmetry despite different drawing positions.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Parallel Two Bulbs
Two bulbs are on separate branches between the same junctions.
Removing one opens only its branch; the other can remain on.
Students explain survival of the alternate path.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Mixed Circuit
A circuit can contain a series component before a pair of parallel branches.
Removing the shared series component can stop all branches.
Students learn that real questions may combine structures.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Series Pair in One Branch
A parallel circuit can have two bulbs in series within one branch and another bulb in a separate branch.
Removing one bulb from the series pair can stop that branch while the other branch still works.
Students reason at branch level and within-branch level.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Branch Added
Adding a new parallel branch creates another possible route.
The original branch can remain complete.
Students understand why branch addition differs from series addition.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Branch Removed
Removing an entire branch can leave other branches intact.
The shared supply and return must still be connected.
Students check the remaining system.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Wire Bridge
A wire intentionally bridging a removed component can restore a conducting path, but only in teacher-approved low-voltage circuit models.
It changes the circuit arrangement and can be unsafe if misused.
Students learn safety and structure together.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Short-Circuit Boundary
Bypassing a component with a very low-resistance wire can create unsafe current paths in real circuits.
Students should never create such connections outside approved classroom instructions.
The conceptual idea of alternative paths should not become unsafe experimentation.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Mains Boundary
Household lights often use parallel arrangements, but home wiring is dangerous and not a Primary classroom experiment.
Students can reason from diagrams without accessing wall circuits.
Safety remains explicit.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Before-and-After Diagrams
A circuit question may show an original diagram and a changed diagram after one bulb is removed.
Students compare connections rather than count components.
This supports visual reasoning.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
What Stays the Same
When one bulb is removed, the battery and remaining wires may stay unchanged.
Students should identify the one structural change before predicting effects.
This is controlled counterfactual reasoning.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
What Changes
The removed bulb may open one series path or one branch.
The same action can have different system consequences depending on location.
Students learn context-dependent rules.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Final-State Reasoning
After several switches or bulbs change, only the final connection state matters for the answer.
Students should redraw or retrace the final circuit.
This prevents applying changes one at a time incorrectly.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Path Table
A student can list for each bulb the switches and components required on its path.
Removing one required element turns that bulb off.
This converts a complex diagram into a compact dependency table.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
On-Off Table
Testing different removed-bulb conditions can create a table of which bulbs remain lit.
Patterns can reveal shared and separate paths.
Students use data to infer structure.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Inference From Behaviour
If removing Bulb A turns off B but not C, A and B may share a required path while C has another path.
The exact physical drawing may not be uniquely determined.
Students learn evidence supports relationships, not always one layout.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Alternative Path
A bulb can remain lit if at least one complete valid path through the source remains.
Alternative paths are the defining advantage of branch arrangements.
Students identify the route explicitly.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Shared Failure
A branch circuit can still fail completely if the battery, master switch or common wire fails.
Parallel arrangement does not make the system immune to every fault.
Students avoid overgeneralisation.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Household Analogy Boundary
It is often said household lights are in parallel so one lamp can fail without all others going out.
The analogy is useful, but real household wiring includes breakers and safety systems beyond Primary Science.
Students learn the limit of the model.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Energy Transfer Link
A lit bulb transfers electrical energy into light and thermal energy.
Removing a bulb stops energy transfer through that bulb’s open path.
Students connect circuit state to energy without saying electricity is used up.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Series Brightness Link
Two identical bulbs in series may be dimmer than one bulb alone in a simple school circuit.
Removing one without closing the gap turns the circuit off rather than making the other brighter.
Students distinguish open-path removal from circuit redesign.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Parallel Brightness Link
Removing one branch bulb can leave another branch bulb operating.
Its exact brightness depends on source and circuit conditions.
Students avoid unsupported quantitative claims.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Experiment Baseline
Before testing bulb removal, confirm the original circuit works.
Without a baseline, a dark bulb after removal may not reveal the cause.
Students learn control conditions.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
One Change at a Time
Remove one bulb while keeping battery, wires and other components unchanged.
Multiple simultaneous changes weaken causal interpretation.
Students practise fair circuit investigations.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Diagram Labels
Label bulbs A, B and C before tracing paths.
Naming prevents confusion when multiple identical symbols appear.
Students communicate changes precisely.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Question Demand
Some questions ask which bulb stays on, others ask why or how brightness changes.
Students should answer the specific demand.
This prevents over-answering.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Exam Transfer
A mixed question can combine series, parallel, switches and bulb removal.
The reliable routine is: mark junctions → trace each bulb path → apply the removal → check shared connections → state final bulbs on/off.
Students build a stable operating method.
In a 3-pax tutorial, each learner traces the final circuit independently after a component is removed. The tutor can diagnose whether the student misunderstood series structure, branch structure, junctions or the meaning of an open path.
Worked Primary 5 Bulb-Removal Cases
Two Bulbs in Series
Bulbs A and B share one loop. A is removed.
The loop is open, so B is also off.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Two Bulbs in Parallel
Bulbs A and B are on separate branches. A is removed.
B can stay on because its branch remains complete.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Master Switch Open
Two parallel bulbs remain in place, but the master switch is opened.
Both are off because the shared path is interrupted.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
One Branch Switch Open
Only A’s branch switch is opened.
A is off while B can remain on if B’s branch is complete.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Series Pair in Branch One
A and B are in series in Branch One; C is alone in Branch Two. A is removed.
A and B are off; C can remain on.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Common Wire Break
A wire before the branch point is broken.
Every branch loses the shared supply path, so all bulbs are off.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Common Return Break
The return wire after branches rejoin is broken.
All branches are interrupted despite being parallel.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Bulb Replaced
A removed bulb is replaced with a working bulb of the correct type.
The path can be restored if all other connections are intact.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Faulty Replacement
A replacement bulb is broken.
The path remains electrically open through that component, so the expected restoration does not occur.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Branch Removed Completely
The wires of one branch are disconnected from both junctions.
Other branches can remain unaffected if the shared network is intact.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Equivalent Redrawing
The same two-branch circuit is drawn as a rectangle instead of a fork.
Removing A produces the same outcome because the connectivity is unchanged.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Crossing-Wire Trap
A drawing has crossing wires without a junction dot.
Students should not create an imaginary alternative path through the crossing.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Unknown Circuit From Data
Removing A turns off B but not C; removing C does not affect A or B.
The data suggests A and B share a required path while C has a separate one, though multiple drawings may fit.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Open Path and Weak Battery
After removing A, B stays on but appears dim.
The on/off result comes from branch structure; the dimness could involve source condition and requires separate evidence.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
Two Changes
A is removed and the master switch is also opened.
The final state is all bulbs off; students should not answer from the removal alone.
A follow-up should ask the learner to point to the surviving complete route or the exact broken route. Saying ‘parallel stays on’ is less informative than tracing the path that remains.
A Safe Circuit Investigation
Use low-voltage classroom circuit kits only. Never remove bulbs from household lamps or experiment with mains electricity.
Begin with a working series circuit and working parallel circuit. Label the bulbs before making changes.
Remove one bulb at a time and record which remaining bulbs stay lit. Replace components only with compatible school-kit parts.
Disconnect power when changing components if required by kit instructions, and stop immediately if wires, batteries or bulbs become unexpectedly hot.
How We Build the Explanation
Mark branch junctions before tracing bulbs.
For each bulb, identify every component and shared wire needed for a complete path.
Apply the change: remove the named bulb and treat that position as an open gap unless the question says it is bridged.
Retrace the remaining bulbs and state which paths are complete. Explain the result in connection language rather than with a memorised series/parallel slogan.
Common Errors
- Removing one bulb is said to turn off every circuit.
- Parallel is assumed to protect against a broken common wire.
- A branch is identified by page position rather than junctions.
- A removed bulb is imagined to leave a conducting connection behind.
- Brightness is answered before on/off state is established.
- Series bulbs are treated as separate because they are drawn far apart.
- Crossing wires are assumed connected without a junction.
- Multiple final changes are not retraced.
Bulb Removal and Switch Control
A branch switch and a removed bulb can both open the same route. Students compare the cause but recognise the same path consequence.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Brightness
If a circuit is redesigned rather than simply opened, brightness can change. Students distinguish ‘remove and leave a gap’ from ‘remove and reconnect the remaining circuit’.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Energy
An open branch stops electrical energy transfer through that branch, while other complete branches can continue converting electrical energy.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Household Lighting
The familiar observation that one failed household lamp does not normally turn off all others supports the idea of independent branches, but household systems are not classroom experiment targets.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Fault Diagnosis
A bulb that goes out together with another may reveal shared dependencies. Behavioural data can help infer circuit structure.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Equivalent Diagrams
Students redraw the same circuit in different layouts and repeat the change. Identical outcomes confirm that connection structure, not artistic arrangement, controls behaviour.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Bulb Removal and Mixed Circuits
A complex circuit can have series components inside one branch. Students solve locally first, then globally.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Independent Retrieval
A week later, students receive four diagrams with one bulb crossed out and predict the final on/off pattern without notes. The method should survive the changed visual layouts.
The transfer is successful when the learner can name the surviving route and the broken route explicitly, rather than rely on the label series or parallel alone.
Frequently Asked Questions
What happens if one bulb is removed from a series circuit?
The single path is opened, so the other bulbs in that path go off.
What happens if one bulb is removed from a parallel circuit?
Other branches can remain complete, so bulbs on those branches can stay on.
Does parallel mean one fault can never turn off all bulbs?
No. A fault in a common supply, return, battery or master switch can stop every branch.
Why does removing a bulb create a gap?
The bulb itself forms part of the conducting path. Removing it disconnects the contacts unless another conductor bridges them.
Can brightness change too?
Yes in some rearrangements, but first determine which bulbs remain connected. On/off state comes before brightness analysis.
Can a faulty bulb behave like a removed bulb?
Yes. A failed bulb can interrupt its path even while physically present.
Does this replace the whole Electricity topic?
No. It owns the focused bulb-removal comparison. Use the Primary 5 Science Learning Hub for complete circuits, switches, brightness and fault diagnosis.
Primary 5 Bulb-Removal Checklist
- Is this series, parallel or mixed?
- Where are the junctions?
- Which path requires the removed bulb?
- Did removal leave a gap?
- Do other branches still connect both battery terminals?
- Is there a broken common supply or return?
- Am I answering on/off before brightness?
- Did I retrace the final circuit after all changes?
Continue through the Primary 5 Science Learning Hub.
eduKate Sengkang teaches Primary Science in focused groups of up to three students. Lessons are by appointment. For current class availability, WhatsApp +65 8823 1234.
Properly Taught Kids Shine a Bright Light Into the Future.
