You will learn
- Explain how a filament lamp works.
- Compare lamp types.
- Explain energy efficiency.
- Troubleshoot a lamp circuit.
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
- Filament lamps glow and get hot.
- LEDs waste less energy.
- Efficient lamps save electricity.
- Check connections when a lamp fails.
Words to know
a thin wire that glows when electricity passes
a light-emitting diode that gives light efficiently
wasting little energy
to find and fix a fault
1. Discover: The warm bulb
Papa’s old filament bulb feels hot after an hour, but the new LED bulb feels cool. “The old one turns most of the energy into heat,” he says. “The LED turns more into light, so it is cheaper to use.”
Think: Why is wasted heat a problem?
2. Understand: Lamps
Idea 1: Filament lamps
A filament lamp has a very thin wire that glows white-hot when current passes. Most of its energy becomes heat, so it is not very efficient.
Idea 2: LEDs
An LED lamp turns most energy into light and lasts much longer. It is efficient. Fluorescent tubes are in between.
Idea 3: Troubleshooting
If a lamp does not light, troubleshoot: check the cell, the connections, the switch, and whether the lamp is blown. Change one thing at a time.
3. Worked examples
Example 1 (I show you): Compare
Filament vs LED.
- Filament hot.
- LED cool.
- LED efficient.
Answer: LEDs are more efficient.
Example 2 (We do it together): Troubleshoot
Lamp off.
- Check cell.
- Check wires.
- Check lamp.
Answer: Check parts one at a time.
Example 3 (You try): Explain
Why hot?
Show the steps and answer
- Wire resists.
- Energy as heat.
- Wasted.
Answer: Filaments waste energy as heat.
Did you know?
An LED bulb can last 25 times longer than a filament bulb and use only a fraction of the electricity.
Why this matters
Efficient lamps save money and reduce pollution from power stations.
4. Explore: Lamp troubleshooting
Find the fault in four non-working circuits.
- Receive four faulty circuits.
- Check cell and connections.
- Test the lamp in a working circuit.
- Record the fault.
Think about it: what did you notice?
What did you notice? Each fault had a simple cause.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is a thin wire that glows.
- An ___ is a light-emitting diode.
- ___ means wasting little energy.
- To ___ is to find a fault.
Guided practice
Question 1. What glows in a filament lamp?
The filament.
Question 2. What is an LED?
Efficient lamp.
Question 3. What is efficient?
Wastes little.
Independent practice
Level 1: Start
- What glows in a filament lamp?
- What is an LED?
- What is efficient?
- What is troubleshoot?
- Why is it hot?
Level 2: Grow
- Why use LEDs?
- Why check one thing?
- Why not touch hot lamps?
Level 3: Stretch
- Compare lamps.
- Find faults.
- Explain efficiency.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Recommend a lamp for your home.
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: Efficiency differs.
Fix: Usually wasted.
8. Lesson summary and revision card
- I can explain how a filament lamp works.
- I can compare lamp types.
- I can explain energy efficiency.
- I can troubleshoot a lamp circuit.
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
- Filament lamps glow and get hot.
- LEDs waste less energy.
- Efficient lamps save electricity.
- Check connections when a lamp fails.
11. Next lesson
Next lesson: Switches. 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.
- Explain how a filament lamp works. [3 marks]
- Compare filament and LED lamps. [3 marks]
- List three troubleshooting steps. [3 marks]
- Safety rule? [1 mark]
Total: 10 marks.
Marking guide and model answers
- Thin wire [1]; current heats it [1]; glows [1]
- Filament wastes heat [1]; LED efficient [1]; conclusion [1]
- 1 each
- Any [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 glows in a filament lamp?
- What is an LED?
- What is efficient?
- What is troubleshoot?
- Why is it hot?
- Why use LEDs?
- Why check one thing?
- Why not touch hot lamps?
- Compare lamps.
- Find faults.
Homework
Check the lamps at home and note which are LED.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What glows in a filament lamp? | The filament. | 1 |
| 2. What is an LED? | Efficient lamp. | 1 |
| 3. What is efficient? | Wastes little. | 1 |
| 4. What is troubleshoot? | Find the fault. | 1 |
| 5. Why is it hot? | Wasted heat. | 1 |
| 6. Why use LEDs? | Save energy. | 1 |
| 7. Why check one thing? | Find the cause. | 1 |
| 8. Why not touch hot lamps? | Burns. | 1 |
| 9. Compare lamps. | Table. | 1 |
| 10. Find faults. | List. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 The filament.; 2 Efficient lamp.; 3 Wastes little.; 4 Find the fault.; 5 Wasted heat.. Level 2: 1 Save energy.; 2 Find the cause.; 3 Burns.. Level 3: 1 Table.; 2 List.; 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 Explain how a filament lamp works | 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 Compare lamp types | 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 Explain energy efficiency | 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 Troubleshoot a lamp 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 |
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 lamps are the same.” Efficiency differs.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain lamp types and troubleshoot.
- 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 studies lamps and efficiency. You do not need to be an expert to help.
- Look at bulbs together.
- Ask “Which is efficient?”
- Do not touch hot bulbs.
- 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 how a filament lamp works; compare lamp types; explain energy efficiency; troubleshoot a lamp circuit.
Prerequisite knowledge. Grade 3 physical ideas: forces, magnets, materials and measuring in fair tests.
Materials. Cells, lamps, 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. Make faulty circuits.
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 two lamps and ask, “Which uses less energy?”
Explanation (10 min). Teach lamps.
Guided activity (10 min). Learners troubleshoot.
Independent activity (10 min). Learners compare.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Efficient? What 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. “All lamps are the same.” Efficiency differs.
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. Explain lamp types and troubleshoot. 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 6; 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.