Input and Output Devices

2. a video camera that is connected to a computer or integrated in a device and allows its images to be seen online.
4. an electroacoustic transducer that converts an electrical audio signal into a corresponding sound.
8. an optical device that projects an image onto a surface, commonly a projection screen.
10. a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface of a computer.
11. an instrument for converting sound waves into electrical energy variations which may then be amplified, transmitted, or recorded.

1. a panel of keys that operate a computer or typewriter
3. a device with parts that cover each ear through which you can listen to something, such as music, without other people hearing.
5. is a device that optically scans images, printed text, handwriting or an object and converts it to a digital image
6. often used to control video games
7. it displays information
9. a peripheral machine which makes a persistent representation of graphics or text, usually on paper.