You will learn
- Define conductor and insulator.
- Test materials in a circuit.
- Sort materials.
- Explain uses of each.
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
- Metals are conductors.
- Plastic, rubber, wood and glass are insulators.
- Water with impurities conducts.
- Insulators keep us safe.
Words to know
a material that lets electricity pass
a material that blocks electricity
a shiny material that usually conducts
a circuit with a gap for testing materials
1. Discover: The test circuit
Naa builds a circuit with a gap. She places a coin in the gap and the lamp lights. She tries a plastic comb and the lamp stays off. “The coin is a conductor,” she writes. “The comb is an insulator.”
Think: Why is plastic used on plug casings?
2. Understand: Conductors
Idea 1: Conductors
A conductor lets electricity pass easily. Most metals, such as copper, iron and aluminium, are conductors. Graphite in pencils conducts too.
Idea 2: Insulators
An insulator does not let electricity pass. Plastic, rubber, glass, dry wood and cloth are insulators.
Idea 3: Testing
Use a test circuit with a gap. Place the material in the gap. If the lamp lights, the material conducts. Make sure it is a fair test by using the same cell and lamp.
3. Worked examples
Example 1 (I show you): Predict
Copper coin.
- Metal.
- Conducts.
- Lamp on.
Answer: The lamp lights.
Example 2 (We do it together): Predict
Plastic comb.
- Plastic.
- Insulates.
- Lamp off.
Answer: The lamp stays off.
Example 3 (You try): Use
Plug case.
Show the steps and answer
- Plastic.
- Keeps current inside.
- Safe.
Answer: Plastic insulates.
Did you know?
Pure water hardly conducts electricity, but the minerals in tap and sea water make it a conductor, which is why water and electricity do not mix.
Why this matters
Knowing which materials conduct keeps us safe and helps design electrical devices.
4. Explore: Conductor test
Test ten materials in a test circuit and sort into conductors and insulators.
- Build a gap circuit.
- Place each material in the gap.
- Record lamp on or off.
- Sort into groups.
Think about it: what did you notice?
What did you notice? Metals made the lamp light; plastics and wood did not.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ lets electricity pass.
- An ___ blocks electricity.
- Most ___ are conductors.
- A ___ circuit has a gap for testing.
Guided practice
Question 1. What is a conductor?
Lets electricity pass.
Question 2. What is an insulator?
Blocks.
Question 3. Name a conductor.
Copper.
Independent practice
Level 1: Start
- What is a conductor?
- What is an insulator?
- Name a conductor.
- Name an insulator.
- What test?
Level 2: Grow
- Why plastic on plugs?
- Why metals in wires?
- Why fair test?
Level 3: Stretch
- Test materials.
- Sort them.
- Explain a use.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Why are electricians’ tools handled with rubber?
Show a sample answer
Explain.
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: Test them.
Fix: Tap water conducts.
8. Lesson summary and revision card
- I can define conductor and insulator.
- I can test materials in a circuit.
- I can sort materials.
- I can explain uses of each.
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
- Metals are conductors.
- Plastic, rubber, wood and glass are insulators.
- Water with impurities conducts.
- Insulators keep us safe.
11. Next lesson
Next lesson: Electrical safety. 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 conductor and insulator. [2 marks]
- Describe the test circuit. [3 marks]
- Sort four materials. [3 marks]
- Why are plugs plastic? [2 marks]
Total: 10 marks.
Marking guide and model answers
- Conductor [1]; insulator [1]
- Gap [1]; material in gap [1]; lamp result [1]
- 1 each
- Insulator [1]; safety [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 conductor?
- What is an insulator?
- Name a conductor.
- Name an insulator.
- What test?
- Why plastic on plugs?
- Why metals in wires?
- Why fair test?
- Test materials.
- Sort them.
Homework
Find five conductors and five insulators at home and list them.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a conductor? | Lets electricity pass. | 1 |
| 2. What is an insulator? | Blocks. | 1 |
| 3. Name a conductor. | Copper. | 1 |
| 4. Name an insulator. | Plastic. | 1 |
| 5. What test? | Gap circuit. | 1 |
| 6. Why plastic on plugs? | Safe. | 1 |
| 7. Why metals in wires? | Conduct. | 1 |
| 8. Why fair test? | Same lamp and cell. | 1 |
| 9. Test materials. | Table. | 1 |
| 10. Sort them. | Two groups. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Lets electricity pass.; 2 Blocks.; 3 Copper.; 4 Plastic.; 5 Gap circuit.. Level 2: 1 Safe.; 2 Conduct.; 3 Same lamp and cell.. Level 3: 1 Table.; 2 Two groups.; 3 Sentence..
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 Define conductor and insulator | 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 Test materials in a 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 Sort materials | 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 Explain uses of each | 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: “All shiny things conduct.” Test them.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Test and sort conductors and insulators.
- 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 tests materials. You do not need to be an expert to help.
- Look for plastic and metal parts.
- Ask “Why plastic here?”
- Never test mains.
- 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: define conductor and insulator; test materials in a circuit; sort materials; explain uses of each.
Prerequisite knowledge. Grade 3 physical ideas: forces, magnets, materials and measuring in fair tests.
Materials. Cells, wires, lamp, materials. 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. Collect materials.
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 coin and plastic and ask, “Which will conduct?”
Explanation (10 min). Teach conductors.
Guided activity (10 min). Learners test.
Independent activity (10 min). Learners sort.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Conductor or insulator?
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. “All shiny things conduct.” Test them.
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. Test and sort conductors and insulators. 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 4 Unit 6, topic 9; Next Generation Science Standards, energy; Cambridge Primary Science Stage 4, physics: electricity; IB Primary Years Programme, how the world works. These sources informed the lesson.