You watch a video in your bedroom. But the Wi-Fi router is in the living room — behind a wall! How does the signal reach you?
In this lesson you will discover the secret of invisible waves — and even learn where the best spot for a router is in an HDB flat. Let's go! 🚀
Wi-Fi carries messages using radio waves. They are a kind of light your eyes cannot see. They zoom through the air at amazing speed — no wires needed!
Wave spotter: One of these also sends messages with invisible radio waves. Tap it!
Sunlight passes through a glass window, right? Radio waves are even better at passing through things — they can slip through wood, glass, and even brick. But every material lets a different amount through.
Wall tester: Tap a material to build the wall and fire a Wi-Fi wave at it. Try all five!
When a wave passes through a wall, the wall soaks up a bit of its energy — like a runner getting tired after each hill. More walls between you and the router = weaker Wi-Fi.
Detective time: The router 📶 is in the living room. Which room will have the weakest Wi-Fi? Tap that room!
Radio waves slip through wood and brick, but metal is like a mirror to them — the wave bounces off! Thick concrete and even big tanks of water soak up lots of the wave too.
Fun fact: your body is mostly water — a room full of people can weaken Wi-Fi a little too!
Your family just got a new router. Using everything you learnt, tap the best spot for it in this flat.
Amazing work! Here's what you discovered today:
🌊 Wi-Fi is an invisible radio wave — a kind of light your eyes can't see.
🧱 Waves can pass through walls — like sunlight through glass, just invisible.
📉 Every wall soaks up some energy — more walls means weaker signal.
🪞 Metal bounces waves away, and thick concrete and water soak up lots.
🏠 The best router spot is open, high up, and near the middle of your home.
Next time your video loads slowly, you'll know exactly why — count the walls! 😄📶