How Does a Laptop Know When Its Lid Closes?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How does a laptop know when its lid closes?

The Big Idea

Close your laptop, and the screen turns off at once. Open it, and the laptop wakes up. There is no button to push, so how does it know? A magnet gives it a clue!

A Tiny Magnet

Step one: a tiny magnet. Many laptops have a tiny magnet in the lid. There is a magnetic sensor in the body of the laptop.

Lid Closes

Step two: the lid closes. When you close the lid, the magnet moves near the sensor. The sensor tells the computer to turn off the screen and go to sleep.

Lid Opens

Step three: the lid opens. When you open the lid, the magnet moves away and the laptop wakes up. Tablets and phone covers use the same trick.

A Closer Look

Let's take a closer look! The magnet is in the lid. The sensor is in the body. Closing makes them meet. Then the laptop sleeps.

Quick Facts

Quick facts! The sensor is often a Hall sensor, which can detect magnetic fields. Tablets and covers use this trick too. Closing the lid makes the laptop sleep. Opening it wakes it up.

Think Like a Scientist

Now, think like a scientist! Close a laptop slowly with a grown-up. See when the screen turns off. Notice where the sleep point is. Try it a few times and compare. Then tell a friend what you found out.

Outro

A laptop knows when its lid closes because a magnetic sensor notices a tiny magnet in the lid. Science is amazing! Stay curious! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!