Summary 305 320 as you can see peripheral devices

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Summary 3:05-3:20 As you can see peripheral devices perform a lot of different functions. Some are essential to everyday computer use and some offer very specific functionality. And remember there are three types ofperipheral devices. Input devices, output Devices and I/O devices, which combine both input and output functions. A peripheral device is any external component that either sends information to or retrieves information from a computer. There are three categories of peripheral devices: Input devices Output devices Input & Output (I/O) devices The following table describes some of the most common peripheral devices: Device Considerations Keyboard Keyboards connect through a USB port. Many keyboards include special function keys that simplify playing music or browsing the Internet. Some keyboards include a built-in USB port that can be used to connect other peripheral devices. Almost every desktop computer requires at least a keyboard to function. Most computers require a keyboard, mouse, and display device in order to function properly. Mouse A mouse can be either wired or wireless. A wired mouse uses a USB port to connect to the computer. A wireless mouse uses an internal battery for power and uses RF signals (e.g., Bluetooth) to connect to a receiver, which is either connected to a USB port or integrated with the computer.
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When selecting a mouse, consider the following: Because optical mice use light rays to detect motion, they don't work on some surfaces. Some mice have internal motion sensors, allowing them to detect movements while in the air. This particular device can attach to a user's head and move the cursor when the head moves. You can select mice with additional buttons or a scroll wheel to add functionality. High-end gaming mice use a rating of dots per inch (DPI). The rating denotes how many steps (cursor movements) are counted in a single inch. Digitizer A digitizer captures some type of analog signal and converts it into digital data. Some common types of digitizer devices include: Graphics Tables - Graphics tablets capture analog stylus strokes written on a pad and convert them to digital data. These are mostly used by graphic artists to capture hand-drawn images. Document Scanners - Document scanners are specifically designed to convert paper documents into digital documents, such as PDFs or Rich Text Format files. Document scanners use optical character recognition (OCR) to create editable word processor documents. 3D Scanners - 3D scanners use either physical contact or lasers to map the size and shape of a physical object and convert it into a 3D digital model. Game controllers Game controllers are input devices designed specifically for computer gaming. There are two main types of game controllers: Gamepads are handheld controllers with directional controls on the left and buttons on the right.
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