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- 1. A. Computer BasicsA. Computer Basics Unit Objectives: 1.01-1.04 1.00 Examine the Role of Hardware and Software. Updated 08/2009 - BHUpdated 08/2009 - BH
- 2. What Is A Computer?What Is A Computer? An electronic device that receives data, processes data, stores data, and produces a result (output). A collection of electronic circuits, which can be on or off (open or closed).
- 3. These two states of the circuit are represented by two digits, 0 and 1. o Called the binary system. o Combining bits (0 and 1), you can represent any character or number.
- 4. Benefits of Using ComputersBenefits of Using Computers Error-free calculationsError-free calculations SpeedSpeed FlexibilityFlexibility StorageStorage Consistency and repetitionConsistency and repetition
- 5. What Is AWhat Is A Computer System?Computer System? • Hardware: the tangible, physical equipment that can be seen and touched such as: • Computer Case • Monitor • Keyboard and Mouse • Disk Drive • Speakers
- 6. o Software: the intangible set of instructions that tells the computer what to do; know as programs or software programs. oTwo types of software Application System Software
- 7. Types of ComputersTypes of Computers • Supercomputer: most powerful -Used to do things like predict hurricanes and navigate satellites • Mainframes and Minicomputers: Used by business and government to process large amounts of information
- 8. • Personal computers: smaller and less powerful than the other types of computers •Desktop •Notebook or Tablet •Laptop
- 9. Personal ComputersPersonal Computers • Desktop computer: designed to be used on a desktop. • Notebook/Tablet computer: designed to be used on a desktop but still small enough to be portable. • Laptop computer: designed to be small enough and light enough to be used on your lap.
- 10. • Web TVWeb TV: provides easy access to the Internet without having to have a traditional computer. – Enables you to connect to the Internet and usually includes a keyboard or other device for entering and selecting data. Additional Types of ComputersAdditional Types of Computers
- 11. • PDAsPDAs (Personal Digital Assistants) a handheld device that is often used in conjunction with a desktop or other PC. – May have a special keyboard, some use a pen or stylus for entering data - Data can be transferred to a desktop or laptop computer
- 12. Data CommunicationsData Communications • The technology that enables computers to communicate. • The transmission of text, numeric, voice or video data from one machine to another. • Popular examples: Internet, electronic messages (e-mail), faxes, and electronic or online banking
- 13. • Four components: – Sender: the computer that is sending the message. – Receiver: the computer receiving the message. – Channel: the media that carries or transports the message. (telephone wire, coaxial cable, microwave signal, or fiber optic) – Protocol: the rules that govern the orderly transfer of the data sent.
- 14. • When computers are connected to other computers • They can share information and sometimes hardware (printers) • Two Types: Local-Area and Wide-Area NetworkNetwork
- 15. Local Area Networks (LAN):Local Area Networks (LAN): Computers connected together in a relatively close location such as in the same building or department. The data and software for these computers are stored on a central computer called the file server.
- 16. Wide Area Networks (WAN):Wide Area Networks (WAN): When local area networks are expanded to include several local area networks within a city, state, region, territory, country, continent, or the world.
- 17. The microprocessor, the brains of the computer. Referred to a CPU or processor Housed on a tiny silicon chip Chip contains millions of switches and pathways that help your computer make important decisions. Central Processing UnitCentral Processing Unit
- 18. CPU knows which switches to turn on and which to turn off because it receives its instructions from computer programs (software). CPU has two primary sections: Arithmetic/logic unit Control unit
- 19. Arithmetic/logic unit (ALU):Arithmetic/logic unit (ALU): - Performs arithmetic computations and logical operations; by combining these two operations the ALU can execute complex tasks. - Arithmetic operations include addition, subtractions, multiplication, and division. - Logical operations involve comparisons.
- 20. Control UnitControl Unit: is the “boss” and coordinates all of the CPU’s activities. Uses programming instructions, it controls the flow of information through the processor by controlling what happens inside the processor. We communicate with the computer through programming languages. Examples: COBOL, C++, HTML, Java Script or
- 21. MemoryMemory Found on the motherboard Short term Random Access Memory (RAM)Random Access Memory (RAM) Long term Read Only Memory (ROM)Read Only Memory (ROM)
- 22. Random Access Memory (RAM)Random Access Memory (RAM) Memory on the motherboard that is short term; where data, information, and program instructions are stored temporarily on a RAM chip or a set of RAM chips. Known as the main memory. This memory is considered volatile. The computer can read from and write to RAM.
- 23. When the computer is turned off or if there is loss of power, what ever is stored in RAM disappears. “Temporary Memory” – Short Term
- 24. Read-Only Memory (ROM)Read-Only Memory (ROM) Memory on the motherboard that is long term; where the specific instructions that are needed for the computer to operate are stored. This memory is nonvolatile and your computer can only read from a ROM chip.
- 25. The instructions remain on the chip regardless if the power is turned on or off. Most common is the BIOS ROM; where the computer uses instructions contained on this chip to boot or start the system when you turn on your computer. “Permanent Memory” – Long Term
- 26. Basic Controllers:Basic Controllers: On the motherboard, a device that controls the transfer of data from the computer to a peripheral device and vice versa. Generally stored on one single chip. Examples: keyboards, mouse, monitors, and printers
- 27. Serial and Parallel PortsSerial and Parallel Ports Used to connect our peripheral devices to the computer; usually one serial and one parallel port on a computer. Serial devicesSerial devices transmit data one bit at a time. A modem may be connected to this port. Parallel devicesParallel devices transfer several bits at a time. A printer may be connected to this port.
- 28. Universal Serial Bus (USB)Universal Serial Bus (USB) A new standard that supports data transfer rates of up to 12 million bits per second. A single USB port can be used to connect up to 127 peripheral devices Expected to replace serial and parallel ports in the near future.
- 29. Expansion SlotsExpansion Slots An opening on the motherboard where a circuit board or expansion board can be inserted. Examples: Additional Memory, video cards, modem cards, and sound cards.
- 30. How Does A ComputerHow Does A Computer Process Data?Process Data? PC system case – the metal and plastic case that houses the main system components of the computer. Central to all of this is the motherboard or system board that mounts into the case.
- 31. MotherboardMotherboard Is a circuit board (a thin plate or board that contains electronic components) that contains many integral components.
- 32. Data RepresentationData Representation ASCII (American Standard Code for Information Interchange) The most popular and widely used standardized coding system
- 33. ByteByte Eight bits or combinations of ones and zeros represent a character. Example: 00000001 =1 or 00001010 - 10 KB-Kilobyte roughly 1 thousand bytes MB-Megabyte roughly 1 million bytes GB-Gigabyte roughly 1 billion bytes TB-Terabyte roughly 1 trillion bytes
- 34. Input, Output, & StorageInput, Output, & Storage DevicesDevices Input deviceInput device: hardware that allows you to communicate with your computer. Output device:Output device: hardware that allows your computer to communicate with the user Input/Output - Storage deviceInput/Output - Storage device: hardware that allows you to store or retrieve information
- 35. Computer Input DevicesComputer Input Devices • Keyboard • Mouse/Trackball • Joystick • Light pen • Pointing Stick • Touchpad • Touch screen • Bar code reader • Scanner • Microphone • Graphics Tablet • Digital Cameras
- 36. Computer Output DevicesComputer Output Devices MonitorMonitor: screen that display information such as text, numbers, and pictures-softcopy. PrinterPrinter: gives you information from the computer in printed form – hardcopy. SpeakersSpeakers: allow you to hear voice, music, and other sounds from your computer. ModemModem: allows you to use your computer to communicate with other computers.
- 37. Three Types of PrintersThree Types of Printers Dot MatrixDot Matrix – Gives a printed image in a pattern (matrix) of tiny ink dots. • Less expensive and not as clear Inkjet PrinterInkjet Printer – Better quality of printed document • Machine uses an ink cartridge and a printing element to print a finer image on the paper.
- 38. Laser Best quality of printed documents • Laser beam and an ink toner cartridge are used to produce the images. • More expensive • Quick
- 39. Storage DevicesStorage Devices Magnetic storage devices use oxide- coated plastic storage media called mylar. As the disk rotates in the computer, an electromagnetic read/write head stores or retrieves data in circles called tracks.
- 40. Tracks are numbered from the outside to the inside and as data is stored on the disk it is stored on one of these numbered track. Each track is labeled and the location is stored in a log on the disk known as a file allocation table (FAT).
- 41. Types of Storage DevicesTypes of Storage Devices Hard Disk DriveHard Disk Drive Used to store data inside of the computer Magnetic platter that holds a large amount of information in a form the computer can understand.
- 42. Accessing data is faster Amount of data that can be stored is much more than what can be stored on a floppy disk. Size of Hard drive is measured in megabytes or gigabytes.
- 43. Floppy DiskFloppy Disk Flat circles of iron oxide-coated plastic enclosed in a hard plastic case. Most are 3 ½ inches and have a capacity to hold 1.44 MB or more of data.
- 44. Zip DiskZip Disk Capable of storing tremendous amounts of information They are only the size of a 3 inch disk but can hold as much as 1 gigabyte of data
- 45. Types of Storage DevicesTypes of Storage Devices Magnetic Tape DrivesMagnetic Tape Drives Used for making backup copies of large volumes of data. Very slow Can be used to replace data that may have been lost on the hard drive Look similar to audio tapes. Holds more than Floppy
- 46. Optical DiscsOptical Discs Use laser technology to read and write data on silver platters Compact Disk (CD)Compact Disk (CD) can store 650MB to 800MB of information and data. CD-ROM (Read Only Memory) can only read data from a CD-ROM. You can store data on a CD only if you have a CD Burner and CD-R (writable) or CD-RW (rewritable) CD.
- 47. DVDDVD (Digital Versatile Disk)(Digital Versatile Disk) is the size of a regular CD and can be played in a regular CD or in a DVD movie player. DVDDVD can store 4.8GB to 8.0GB of information and data. DVD-ROM is readable only (a movie DVD). You can store data on a DVDDVD only if you have a DVD BurnerDVD Burner and DVD+R/DVD-R (writable) or DVD-RW (rewritable) DVD.
- 48. Systems SoftwareSystems Software A group of programs that coordinate and control the resources and operations of a computer system. Enables all components of the computer system to communicate. Operating System, Utility Programs, and Graphic User Interface (GUI).
- 49. Systems SoftwareSystems Software Operating System (OS):Operating System (OS): Provide an interface between the user or application program and the computer hardware. – Win 95/98/2000/XP/Vista – Mac System 6/7/8/9
- 50. Utility ProgramsUtility Programs Help you perform housekeeping chores; complete specialized tasks related to managing the computer’s resources, file management, and so on. GUI (Graphical User Interface)GUI (Graphical User Interface) Interface between the operating system and the user. Graphical symbols (icons) represent files, disks, programs, and other objects.
- 51. Application SoftwareApplication Software Programs that work with the operating system software to help you use your computer to do specific types of work.
- 52. Application SoftwareApplication Software CategoriesCategories Business Communications Graphics and Multimedia Education and Reference Entertainment and Leisure Integrated Programs
- 53. Business SoftwareBusiness Software SpreadsheetSpreadsheet Manipulate Numeric Data Intersection of row and column is a cell Grade Book, Financial Report DatabaseDatabase Lets you set up an electronic filing systems Sort and Search Address book, Card Catalog Word ProcessingWord Processing Create, edit, and print text documents Report, flyer, memo
- 54. CommunicationsCommunications Works with your modems or network hardware and allows your computer to communicate with other computers. Exchange computer files and email Graphics SoftwareGraphics Software Uses pictures or images to help communicate messages.
- 55. MultimediaMultimedia Combines text, graphics, animation, video, and audio. Clip artClip art Graphical images to be added to documents Desktop PublishingDesktop Publishing Uses both pictures and words to give you the ability to create documents. Newsletters and brochures
- 56. Education &Education & ReferenceReference Available on many topics Easier Quicker AR, CCC, & Encyclopedia EntertainmentEntertainment & Leisure& Leisure Fun Games and simulations Tests your skills Interactive
- 57. Integrated SoftwareIntegrated Software Combine several software applications into one program. Include: Work Processing, Spreadsheet, Database, & Communication Examples: MS Works, MS OFFICE, & Lotus SmartSuite
- 58. Proper Computer CareProper Computer Care Keep food and drinks away from the computer and keyboard. Avoid dusty locations. Use a surge protector. Keep magnets Away.
- 59. Do not block vents on the CPU. Avoid bright sunny locations. Do not move the computer while it is in use. Always exit programs properly. Use a virus check program on a regular basis.
- 60. Proper Diskette CareProper Diskette Care Do not remove from drives while drive in running or light is on. Avoid contact with magnets and electromagnetic fields. Keep disks stored in a clean, cool and dry place with a protective cover.
- 61. Keep protective metal slider in place. Use a virus check program on a regular basis. Avoid hot and cold locations. Make a back-up copy of your programs and files.
- 62. Proper CD or DVD CareProper CD or DVD Care Keep CDs or DVDs stored in a clean, cool and dry place with a protective cover. Avoid touching the back side of the CD or DVD; to avoid scratches. Avoid hot and cold locations.
- 63. Make a back-up copy of your programs and files on CD or DVD. Insert into CD or DVD Drive properly; label facing up. Only write on CD’s or DVD;s with a proper marking Pen on a label or the correct side of the CD or DVD.
- 64. Proper Care of PrintersProper Care of Printers Avoid cold, hot, and dusty locations. Always use the correct ink or toner replacement. Always have the proper printer cable connected to your computer.
- 65. Never pull paper out of a printer in motion. Do not turn off the printer while printing. Read the instruction manual before operating a printer. Always use the proper type of paper in your printer.
- 66. How to Maintain yourHow to Maintain your Computer SystemComputer System Start a notebook of information on your system. Serial numbers Vendor support telephone numbers User IDs Date and vendor for each equipment and software purchase. Trouble log
- 67. Periodically review disk directories & delete unneeded files. Make sure all plug-ins are secure at all times. Turn off the power and disconnect the equipment form the power source before you open the inside of you computer.
- 68. Keep surrounding area dirt and dust free. Back up files and data regularly. Periodically defragment your hard disk. Protect your system from computer viruses Learn to use system diagnostic programs
- 69. ErgonomicsErgonomics The science of designing equipment for a comfortable and safe working environment. Proper Computer ErgonomicsProper Computer Ergonomics Sit up straight and lean forward slightly from the waist. Keep your feet flat on the floor. Your body should be about a hand’s length from the front of the keyboard and centered with the keyboard.
- 70. Place all materials you will type on the rightPlace all materials you will type on the right side of the computer and supplies on theside of the computer and supplies on the left side.left side. Keep any items you are not using off yourKeep any items you are not using off your desk.desk. Occasionally rest your eyes and take shortOccasionally rest your eyes and take short breaks.breaks. Avoid lights that cause glare on the monitor.Avoid lights that cause glare on the monitor.
- 71. Keep your fingers on the home row keys and curved. Keep your wrists up, not touching the keyboard or desk. Focus your eyes on the book, copy or screen.
- 72. Questions of the DayQuestions of the Day 1. Definition of Hardware1. Definition of Hardware 2. Definition Of Software2. Definition Of Software 3. Definition of CPU3. Definition of CPU 4. Definition of RAM4. Definition of RAM 5. Information Processing Cycle5. Information Processing Cycle (Draw the Cycle)(Draw the Cycle)