Conductors and insulators worksheet - Free Printable

Let's solve this worksheet step by step.

🔍 Understanding the Concepts:

- Conductor: A material that allows electricity to flow through it easily. Usually metals and some liquids (like saltwater) are conductors.
- Insulator: A material that resists the flow of electricity. Most plastics, rubber, wood, paper, and dry materials are insulators.

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Now, let’s go through each item and determine whether it is a conductor or insulator.

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✔ Classification:

| Object | CONDUCTOR | INSULATOR |
|---------------------|-----------|-----------|
| pencil | | ✔ |
| ruler | | ✔ |
| lemon | ✔ | |
| 2 Cents | ✔ | |
| Plastic spoon | | ✔ |
| potato | ✔ | |
| Metal spoon | ✔ | |
| Piece of paper | | ✔ |
| key | ✔ | |
| Piece of card | | ✔ |
| Plastic toy car | | ✔ |
| Metal spoon | ✔ | |
| lemon | ✔ | |
| key | ✔ | |

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🔎 Explanation for Each:

1. Pencil – The body is usually made of wood (insulator), and the lead is graphite (a weak conductor). But in most cases, pencils are considered insulators because the outer casing blocks current.
→ ✔ INSULATOR

2. Ruler – Typically made of plastic or wood → ✔ INSULATOR

3. Lemon – Contains citric acid and moisture → conducts electricity due to ions → ✔ CONDUCTOR

4. 2 Cents – Made of metal (copper-plated steel) → ✔ CONDUCTOR

5. Plastic spoon – Plastic does not conduct electricity → ✔ INSULATOR

6. Potato – Contains water and electrolytes (ions) → ✔ CONDUCTOR

7. Metal spoon – Made of metal → ✔ CONDUCTOR

8. Piece of paper – Dry paper is an insulator → ✔ INSULATOR

9. Key – Usually made of metal → ✔ CONDUCTOR

10. Piece of card – Cardboard is dry and non-conductive → ✔ INSULATOR

11. Plastic toy car – Made of plastic → ✔ INSULATOR

12. Metal spoon – Again, metal → ✔ CONDUCTOR

13. Lemon – Same as before → ✔ CONDUCTOR

14. Key – Repeated → ✔ CONDUCTOR

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📝 Final Answer Table:

| Object | CONDUCTOR | INSULATOR |
|---------------------|-----------|-----------|
| pencil | | ✔ |
| ruler | | ✔ |
| lemon | ✔ | |
| 2 Cents | ✔ | |
| Plastic spoon | | ✔ |
| potato | ✔ | |
| Metal spoon | ✔ | |
| Piece of paper | | ✔ |
| key | ✔ | |
| Piece of card | | ✔ |
| Plastic toy car | | ✔ |
| Metal spoon | ✔ | |
| lemon | ✔ | |
| key | ✔ | |

✔ This completes the task!

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