You will learn
- Explain a complete circuit.
- Build a working circuit.
- Troubleshoot faults.
- State current direction.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- A circuit needs a complete loop.
- A gap stops current.
- Faults can be wires, bulb or cell.
- Never short-circuit a cell.
Words to know
a complete path for current
a circuit with no gaps
a circuit with a break
a path with very little resistance that can overheat
1. Discover: The dead bulb
Mariam’s bulb will not light. Her partner checks: wire loose, bulb tightened, cell flat? They find the wire was not touching the bulb base. After fixing it the bulb glows. “A circuit needs a complete loop,” they agree.
Think: What other faults could stop a bulb lighting?
2. Understand: Simple circuits
Idea 1: A loop
A circuit must be a complete loop from one end of the cell, through the components, to the other end. Any gap makes it an open circuit and the current stops.
Idea 2: Fixing
If a bulb does not light, check: wires touching metal parts, bulb tight, switch closed, cell not flat. Test one thing at a time.
Idea 3: Danger
A short circuit happens when a wire joins the cell’s ends directly. It can overheat. Always include a component such as a bulb.
3. Worked examples
Example 1 (I show you): Check
Loop.
- Cell.
- Bulb.
- Wires.
Answer: Complete?
Example 2 (We do it together): Fix
Fault.
- Loose wire.
- Flat cell.
- Open switch.
Answer: Test each.
Example 3 (You try): Explain
Short circuit.
Show the steps and answer
- No bulb.
- Overheats.
- Avoid.
Answer: Dangerous.
Did you know?
Conventional current is drawn flowing from positive to negative, even though the electrons actually move the other way.
Why this matters
Complete circuits are the base of all electrical devices.
4. Explore: Make it light
Use a 1.5 V cell, a bulb and two wires to make the bulb light; then break the circuit in different ways and record what happens.
- Build the circuit.
- Light the bulb.
- Break the loop.
- Record.
Think about it: what did you notice?
What did you notice? Any gap stopped the bulb.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is a complete path for current.
- A ___ circuit has no gaps.
- An ___ circuit has a break.
- A ___ circuit can overheat.
Guided practice
Question 1. What is a circuit?
Complete path.
Question 2. What is open?
Has gap.
Question 3. What is closed?
No gap.
Independent practice
Level 1: Start
- What is a circuit?
- What is open?
- What is closed?
- What is short?
- Which way is current?
Level 2: Grow
- Why a loop?
- Why check wires?
- Why avoid short?
Level 3: Stretch
- Build.
- Break.
- Fix.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why a bulb may not light.
Show a sample answer
List three faults.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: No.
Fix: Dangerous.
8. Lesson summary and revision card
- I can explain a complete circuit.
- I can build a working circuit.
- I can troubleshoot faults.
- I can state current direction.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- A circuit needs a complete loop.
- A gap stops current.
- Faults can be wires, bulb or cell.
- Never short-circuit a cell.
11. Next lesson
Next lesson: Series circuits. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define open circuit and short circuit. [2 marks]
- Describe a complete circuit. [3 marks]
- Explain how to fix a bulb that will not light. [3 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Cell [1]; component [1]; closed loop [1]
- Check wires [1]; check cell [1]; test one at a time [1]
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is a circuit?
- What is open?
- What is closed?
- What is short?
- Which way is current?
- Why a loop?
- Why check wires?
- Why avoid short?
- Build.
- Break.
Homework
Draw a working circuit and one with a fault.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a circuit? | Complete path. | 1 |
| 2. What is open? | Has gap. | 1 |
| 3. What is closed? | No gap. | 1 |
| 4. What is short? | Direct path. | 1 |
| 5. Which way is current? | Positive to negative. | 1 |
| 6. Why a loop? | Current flows. | 1 |
| 7. Why check wires? | Fault. | 1 |
| 8. Why avoid short? | Overheat. | 1 |
| 9. Build. | Circuit. | 1 |
| 10. Break. | Table. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Complete path.; 2 Has gap.; 3 No gap.; 4 Direct path.; 5 Positive to negative.. Level 2: 1 Current flows.; 2 Fault.; 3 Overheat.. Level 3: 1 Circuit.; 2 Table.; 3 Notes..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Explain a complete circuit | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Build a working circuit | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Troubleshoot faults | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 State current direction | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Current flows even with a gap.” No.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Build and fix circuits.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child builds simple circuits with safe cells. You do not need to be an expert to help.
- Spot circuits.
- Ask “What is the loop?”
- Never touch sockets.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: explain a complete circuit; build a working circuit; troubleshoot faults; state current direction.
Prerequisite knowledge. Grade 5 ideas: simple circuits, conductors and insulators, and magnets.
Materials. Cells, bulbs, wires. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Check cells.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Show a lit bulb and ask, “What does it need to glow?”
Explanation (10 min). Teach circuits.
Guided activity (10 min). Learners build.
Independent activity (10 min). Learners troubleshoot.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Is it a complete loop? Where is the fault?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Current flows even with a gap.” No.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Build and fix circuits. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 6 Unit 7, topic 3; Next Generation Science Standards, energy and forces; Cambridge Lower Secondary Science, physics; IB Primary Years Programme, how the world works. These sources informed the lesson.