Cho3 Flashcards

Question

what’s a sensor

Answer 1

an input device that reads physical data from its surroundings

Answer 2

primary ROM RAM secondary HDD SSD OPTICAL DEVICES FLASH MEMORY STICK

Answer 3

part of the computer memory which can be accessed directly from the CPU

Answer 4

Electronically erasable programmable ROM ROM chip that can be modified by the user, which can be erased and written repeatedly using pulse voltages

Answer 5

Dram over Sram - less expensive to manufacture - consume less power than Sram - have a higher memory capacity than SRAMs Sram over Dram - has a faster data access time - accessed at a high frequency - doesn’t need to be refreshed

Answer 6

ram - temporary memory device - volatile - can be written and read from - used to store data which like files - can be increased in size to improve speed rom - permanent memory - non volatile - data stored cannot be altered - sometimes used to store BIOS and other data needed at start up

Answer 7

it’s made up of a matrix of fuses it uses a PROM writer which uses an electric current to alter specific cells by Burning fuses in the matrix used in RFID tags

Answer 8

it uses floating gate transitory and capacitors rather than fuses and UV light is used to program an EPROM through a quarts window used in applications which are under development

Answer 9

it involves installing microprocessors into devices to enable operations to be controlled in a more efficient way like cookers refrigerators and central heating pros - small in size and easy to fit in other devices - low cost to manufacture - usually dedicated to one task cons - difficult to upgraded devices to take advantage of new tech - troubleshooting faults in the device becomes a specialists task - it’s open to hackers if the device is access over the internet - it’s wasteful and defaults will be thrown away rather than upgrading

Answer 10

SSD - more reliable - are considerably lighter - have a lower power consumption - don’t have to get up to speed to start working - runs much cooler than HDDs - very thin - data considerably faster

Answer 11

in pits and bumps on a spiral tracy

Answer 12

dad uses a dual layering which increases storage capacity or if it’s single layer the pit size and track width are both smaller meaning more data can be stored on DVD surface Blu rays uses blue laser they come with secure encryption system prevents copywriting

Answer 13

when two layers are sandwiched like in DVDs

Answer 14

1. data from document is sent to printer device 2. printer driver ensures that data is in a format that the chosen printer can understand 3. check is made by printer to ensure it’s avail r to print 4. data sent to the printer and stored in printer buffer 5. printing drum given a +ve charge, it rotated and a laser beam scans across it removing the +ve charge in certain areas leaving neg charged areas which match the text of the page to be printed 6. drum is coated with +vely charged toner. since toner is +belt charged it only sticks to the neg charged parts of drum 7. neg charged sheet of paper is rolled over the drum 8. toner on the drum sticks to the paper to produce an exact copy of the page sent 9. to prevent paper sticking to drum an electric charge on paper is removed after one rotation of the drum 10. paper goes through a fuser where it heat melts the ink so that it fixes permanently to the paper 11. a discharge lamp removed all electric charge from the drum so it is ready to print the next page

Answer 15

1. data from the document is sent to printer driver 2. printer driver ensures that data is in a format good for printer 3. data is sent to the printer and stored in printer buffer 4. a sheet of paper is fed into the main body of the printer. a sensor detects wether the paper is a subtle in the paper feed tray if not it will send an error message 5. after paper is fed the printer head moves from side to side across the paper printing the test or image. the four ink colours are sprayed in their exact amounts to produce desired final colour 6. at the end of each full pass of the print head the paper is advanced very slightly to allow the next line to be printed 7. if there is more data in the printer buffer , then the whole process from stage 5 is repeated until the buffer is empty 8. once done printer sends an interior to the processed which requests for more data to be sent

Answer 16

the digital data is first passed through a DAC where its converter to an electric current this is passed through an amplifier to create a current large enough to drive a loudspeaker then the electric current is then fed to a loud speaker where it is converted into sound

Answer 17

when electric current flows through a coil of wire that is wrapped around an iron core the core becomes a temp electromagnetic and a permanent mag is positioned very close as the current through the coil of wire varies the induced magnet field in the iron core varies so this causes the iron core to be attracted towards the permanent magnet and as the current varies it will cause iron to vibrate since iron core is attracted towards the cone this causes the cone to vibrate to produce sound

Answer 18

when electric current flows through a coil of wire that is wrapped around an iron core the core becomes a temp electromagnetic and a permanent mag is positioned very close as the current through the coil of wire varies the induced magnet field in the iron core varies so this causes the iron core to be attracted towards the permanent magnet and as the current varies it will cause iron to vibrate since iron core is attracted towards the cone this causes the cone to vibrate to produce sound

Answer 19

when a diaphragm in the microphone picks up the air vibrations, the diaphragm also begins to vibrate a copper coil is warapped around a permanent magnet and the coil is connected to the diaphragm using a cone as the diaphragm vibrates the cone moves in and out chasing the copper coil to move forwards and backwards this motion causes the magnetic field around the perment magnet to be disturbed induced an electric current is the current is either amplified or sent to a recording device

Answer 20

benefit - medium cost - screen visibility is good even in sunlight - permits multi touch capability - screen is durable drawbacks - only allows use of bare fingers

Answer 21

benefits - relatively cheap - possible to use bare fingers or gloved fingers or anything to carry out function drawbacks - screen visibility is poor in strong sunlight - does not permit multi touch capability - screen durability is only fair

Answer 22

1. video is sent from a computer to the headset 2. two feeds are sent to an OLED display and lenses placed between the eyes and the screen allows for focusing and reshaping the video for each eye giving it a 3D effect 3. as user moves their head a series of sensors and LEDs measure this movement which allows the image video on the screen to reach to the users head movements 4. headset use binaural sound so it sounds like it’s coming from behind 5. some use infrared sensors to monitor eye movement

Answer 23

monitoring - monitoring a patient to check vitals and heart rate - checking intruders in burglar alarms - checking the temp levels in car control - turning street lights on and off - controlling temp in a central heating conditioning system - controlling traffic lights - controlling greenhouse environment

Answer 24

when one of the car wheels rotated too slowing a magnetic field sensor sends data to microprocessor the microprocessor checks rotation speed of the other three wheels if they’re diff the MP sends a signal to the breaking system and the braking pressure to the affected wheel is reduced the sensors to check the wheel go several times and the braking pressure to all wheels can be constantly changing to prevent any wheels locking up

Cho3 Flashcards

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