Why repair?
Repairing saves money and saves waste. A thing that is fixed does not go to the rubbish. You also learn how things work. Every repair starts with one question: what is wrong?
Find the fault: test one part at a time
Do not change many things at once. First look: is a wire loose, is something broken, is there a smell or noise? Then test one part. Try a new battery. Try the bulb in another lamp. When the problem goes away, you have found the faulty part.
Take apart safely
Always switch off and unplug first. Use the right screwdriver. Put screws in a small cup. Take a photo or draw how the parts sit before you remove them. Never open a device that is plugged into the wall socket, a television, or a microwave. Ask an adult for those.
Fix, rebuild and check
Fix only the faulty part: tighten, clean, replace or glue. Put the parts back in the reverse order. Switch on and check. If it still fails, go back to testing. This loop is the heart of repair.
Making things from common materials
Making uses the same habits. Plan first (a drawing, or a home plan made with free software). Choose a material that suits the job: cardboard is light, wood is strong, plastic bottles are waterproof. Build a small test, check it, improve it. Cooking is a safe experiment too: you change one thing, such as time or heat, and see what happens.
Key formulas and definitions
- Repair loop: Look, Test, Off, Open, Fix, Check
- Change one thing at a time
- Maintenance = small regular care that prevents big faults
- Key terms: fault, test, maintenance, prototype
Worked examples
1. A torch does not light. Name the first three things you should do.
Look (is the switch on, is anything loose?). Test the battery with a new one. Test the bulb or LED in another torch.
2. You changed the battery AND the bulb together and the torch works. Why is this bad testing?
You do not know which one was faulty. Change one part at a time.
3. A fan wobbles. Is oiling it every few months repair or maintenance?
Maintenance. It prevents faults before they happen.
4. Why take a photo before taking a device apart?
The photo shows where every part and wire goes, so you can rebuild it correctly.
5. Which material is best for a model bridge that must be light and cheap: cardboard or iron?
Cardboard. It is light and cheap. Strengthen it by folding it into triangles or tubes.
6. A device is plugged in and sparks. What do you do?
Do not touch it. Switch off at the wall if it is safe, or ask an adult. Never repair a live device.
Common mistakes
- Opening a device that is still plugged in.
- Changing many parts at once, so you never learn what was wrong.
- Losing screws or forgetting where parts go. Use a cup and a photo.
- Forcing parts that do not fit. If it does not go in easily, check the order.