External Devices (Peripherals)

We’ve talked about what’s inside the computer case, but what about the things we plug in? These are called peripherals.

What is a Peripheral?

A peripheral is any device that connects to the computer but is not part of the main computer box. They help us give the computer more “skills.”

Imagine a computer is like a person. The computer case is the body and brain. Peripherals are like tools that person can pick up and use. If you want to draw, you pick up a pencil. If you want to see something far away, you use binoculars. Peripherals work the same way for computers!

Types of Peripherals

We can group peripherals into three main categories based on what they do:

1. Input Peripherals (Giving Instructions)

These devices send information into the computer.

• Webcams: These act like the computer’s “eyes,” letting it see you for video calls.
• Microphones: These are the computer’s “ears,” used for recording your voice or talking to friends online.
• Game Controllers: Joysticks and gamepads let you tell the computer exactly how to move your character in a game.

2. Output Peripherals (Showing Results)

These devices take information from the computer and show it to you.

• Printers: These take digital images and text and turn them into physical copies on paper.
• Speakers and Headphones: These turn digital data into sound that you can hear.
• Projectors: These are like giant monitors that can shine the computer’s screen onto a wall, great for watching movies with friends!

3. Storage Peripherals (Remembering More)

These help the computer keep more information than what fits inside it.

• External Hard Drives: These are like portable bookshelves. You can save thousands of photos or games on them and take them to a friend’s house.
• USB Flash Drives: Often called “thumb drives,” these are tiny and can fit on a keychain, but they can still hold a lot of schoolwork and files.

How do they connect?

Most peripherals today connect using a USB port. USB stands for Universal Serial Bus, and it’s like a universal plug that works for almost everything!

Wireless Connections

Not all peripherals need a cable! Many modern devices use Bluetooth. This is a way for devices to talk to each other through the air using invisible radio waves.

• Wireless Mice and Keyboards: These keep your desk tidy because there are no wires in the way.
• Bluetooth Headphones: These let you listen to music while moving around the room without being tethered to the computer.

Did you know?

• USB plugs were inspired by Poseidon’s trident! The USB symbol looks like a three-pronged spear, which is the symbol of the ancient Greek god of the sea.
• The first computer mouse was made of wood! In 1963, Douglas Engelbart built the very first mouse. It was a wooden box with two metal wheels and only one button.
• A “dongle” is a funny-sounding name for a real thing. A dongle is a small peripheral that plugs into a port to add a specific feature, like Wi-Fi or Bluetooth, to a computer that doesn’t have it.

Check Your Knowledge

1. What is another name for “external devices” that we plug into a computer?
2. If you wanted to show a movie on a big wall for a party, which peripheral would you use?
3. What is the name of the invisible technology that lets a wireless mouse talk to a computer?
4. Why might someone use an external hard drive instead of just saving everything on their computer?