TASK ONE ANSWERS…1.what is a system clock? Is the system that controls how fast all the operations that operates within a computer as the process take place.

2.what are the six factors that that can influence a computer performance?CPU – number of cores and speed (clock rate) RAM – capacity and speed Graphics – GPU speed and video memory Platform – motherboard components and Disks – capacity and speed Operating System – age and configuration of OS have a very large impact on computer performance
3.what is the binary system?methods for representing numbers using only two digits which is 0 and 1.This means that all the data and program instructions that goes into the computer are represented in binary numbers.

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4.what is the difference between bit and the byte?Bit is the smallest unit of information which is held by a computer. A bit is one of the two values, either a 0 or a 1. Eight bits create a byte which can represent a letter of number while byte is an 8-digit unit of data that represents a single character.

5.what is memory cache?a. memory cache is a special high speed memory area on a chip that the CPU can access quickly .It Temporarily stores instructions and data that the processer is likely to use frequently.b. memory cache is a small and fastest memory which is placed between the CPU and RAM. it is accessed at a very high speed than the system memory. As a result, the programs which access the same data or instructions over and over run faster. The CPU does not have to traverse to the main memory to get data. It will first access the cache to find the data. CPU does a check on the cache to find the data, if it does not check then it proceeds to the system memory. This results in faster access to the data in the cache. But it will be lagging if the data is not in the cache and on the system memory. This can be countered with modern Hardware and better cache design. The time taken to traverse the cache is very less as compared to the whole RAM as it is small and fast memory.

6. how are the two types of cache (L1 and L2 cache) different?
Level 1 (L1) cache is extremely fast but relatively small, and is usually inserted in the processor chip (CPU).

Level 2 (L2) cache is often more large than L1; it may be located on the CPU or on a separate chip or coprocessor with a high-speed different system bus interconnecting the cache to the CPU, so as not to be slowed by traffic on the main system bus.

Level 3 (L3) cache is typically specialized memory that works to improve the performance of L1 and L2. It can be significantly slower than L1 or L2, but is usually double the speed of RAM. In the case of multicore processors, each core may have its own dedicated L1 and L2 cache, but share a common L3 cache. When an instruction is referenced in the L3 cache, it is typically elevated to a higher tier cache.

7.what a four types of removable flash memory devices?a. flash memory cardsb. flash memory sticks c. flash memory drivesd. solid state memory drives
8.How are the four type of removable flash memory devices different?a. flash memory cards —-are the removable storage media that are inserted into a flash memory slot in a digital camera ,handled Pc, smartphone or other mobile devices. However flash memory cards have no processer, they are useful only for storage and it stores up to 64 gigabytes unlike other three removable flash memory devices.b. flash memory sticks—-is a form of flash memory media that plugs into a memory stick port in a digital camera ,camcorder, notebook PC, photo printer, and other devices. However It holds up to 2 gigabytes to 2 terabytes of data which very small unlike other three removable flash memory.c. flash memory drives—-a flash memory drives is also called USB flash drives, keychain drive, memory stick ,or key drive ,consists of a finger size module of flash memory that plugs into the USB ports of nearly any microcomputer. However, it has storage capacities up to 256 gigabytes, making the device extremely useful and keep the storage capacities increasing. d. solid state memory drives—–which have far greater capacity (128 gigabytes to 512 terabytes) than flash memory drives or keychain drives, like flash drives they have no moving parts to the break down
9.what are the two basic types of buses in a computer?1.The external buses(front-bus or FSB)2.Expension bus(input or output bus)
10.what is the purposes of buses?
There are generally two buses within a computer: * the internal bus (sometimes called the front-side bus, or FSB for short). The internal bus allows the processor to communicate with the system’s central memory (the RAM). * the expansion bus (sometimes called the input/output bus) allows various motherboard components (USB, serial, and parallel ports, cards inserted in PCI connectors, hard drives, CD-ROM and CD-RW drives, etc.) to communicate with one another. However, it is mainly used to add new devices using what are called expansion slots connected to the input/output bus.

TASK 2..1.true2.false3.true4.false5.true?6.true7.true?8.true9.true10.trueTASK 31.B2.D3.F4.C5.EWork package 2: task 3
Barcode reader is an input device that was invented in June 26, 1974 by Bernard Silver, a graduate student at Drexel Institute of Technology in Philadelphia.A barcode reader is a electronic devices that hand-held or stationary input device used to capture and read information contained in a barcode. However, bar-code reader consists of a a lens, light source and a light sensor which translates optical impulses into electrical ones. Moreover, nearly all barcode readers consist of a decoder circuitry that analyzes the barcode’s image data provided by the sensor and sends the barcode’s content to the scanner’s output port.


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