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WHAT IS SCANNER AND DIFFERENT TYPES OF SCANNER? Scanner is device use to scan document and images and convert it into digital format. Types of scanners: 1.Flatbed scanner 2.Sheet-fed scanner 3.Handheld scanner 4.Drum scanner Flatbed scanners are desktop scanners. Parts of flatbed scanner: 1.Charge coupled device (CCD) array 2.Mirrors 3.Scan head 4.Lens 5.Filters 6.Interface ports 7.Control circuitry The core component of scanner is CCD array.CCD is technology for image capture in scanners. CCD is collection of tiny light sensitive diodes,which converts light into electric charge. The image of document that we scan reaches the CCD array through a series of mirrors,filters and lenses. Sheet-fed scanners are similar to flatbed scanners except that the document is moved and the scan head is immobile. Handheld scanners use same basic technology as a flatbed scanner,but depends on the user to move them. This type of scanner does not provide good image quality. Drum scanners are...

                      TYPES OF RAM RAM is use in our computers and mobile phones. It is RANDOM ACCESS MEMORY use for storing current running programsor apps or data currently working on. RAM has two types 1.SRAM 2.DRAM SRAM is static ram and DRAM is dyanamic ram. Once data is stored in SRAM it is remain until power applied to it but in case of DRAM data lost over time so we have to refresh the data. SRAM is more faster than DRAM. Also SRAM consume less power than DRAM. Both SRAM and DRAM is made up of transistors.SRAM has more transistor than DRAM. SRAM is expensive than DRAM. DRAM is use in main memory while  SRAM is use in cache memory which is the fastest memory. Due to low cost DRAM is use in main stream memory and SRAM is use when required to construct high speed device.                                      ...