1. Principles of Information Technology Module 4 Test Review Peripheral Devices

2. Review Questions A peripheral device is defined as__________ Any device connected to a computer but is secondary in relation to the CPU An internal peripheral device operates____the computer case inside An external peripheral device operates___the computer case outside

3. Review Questions Name three functions that peripheral devices perform in relation to the computer to which it is attached. Input, Output, Storage Give an example of an analog stream of data. Man on stage playing a piano Give an example of a digital signal Recording of a man playing the piano What is difference between the two? Analog is every tone interpreted by the human ear. Digital is an estimation of every tone before interpretation by the human ear.

4. Review Questions CNC stands for ______________and is related to the use of_________as peripheral devices. Computer Numerically Controlled Machines Digital photos are made up of small picture elements called_________________ Pixels _________________is a measure of how a printer prints an image Dots per inch

5. Review Questions __________is a measure of how a monitor displays an image Pixels Per Inch The resolution of an image is measured by the image's________ Pixel dimensions How is a camera's megapixel rating calculated The product of it’s pixel dimensions What type of camera is your phone camera? Ultra compact

6. Review Questions What does JPEG stand for? Joint Photographic Experts Group – Image compression What does PGN stand for? Portable Network Graphics – most used lossless image compression format What is the difference between optical and digital zoom? Optical involves lens adjustment where digital involves in-camera image processing Why would you want to resize a photo taken from a digital camera before emailing To reduce the number bytes of data being sent to speed transmission

7. Review Questions Define Megapixel Used to specify the pixel dimensions of a photo equal to approximately 1 million pixels Explain the "rule of thirds" as it relates to photography Divides a “shot” into 9 parts or 4 points of intersection. At these 4 points would be placed the interesting points of your picture Define 3D printing. Layer by layer build up of material to form 3 dimensional objects

8. Review Questions What is the oldest form of 3D printing? Vat Polymerization – exposes a vat of liquid polymers to ultra-violet light What 3D printing process is the most common technology. Material Extrusion – applying layers of extruding melted polymers to build up the printed object List 3 uses of 3D printing. Prototyping, Consumer products, Medical

9. Review Questions What is the 3D printer market expected to do in the future? Triple by the year 2018 exceeding 6 billion $ Describe how a ink-jet printer works. Sprays ink through small nozzles onto a page to produce images Explain how a laser printer works Laser beam draws images on a light sensitive drum. The drum picks up a fine powdered ink called toner and transfers the toner to the paper

10. Review Questions What determines the quality of the images a printer can produce? Printer Resolution or higher numbers of Dots per inch All printers require a driver in order to operate with a computer. What is a driver? Software that allows the computer’s operating system to communicate with and control the printer