Computer Class Presentation-3


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Computer Class Presentation-3

  1. 1. •Presentation #3 1
  2. 2. Measures and Properties of Electricity• Electrical energy properties are measured in various ways  Volt  Amp  Ohm  Watt 2
  3. 3. AC and DC• Alternating Current (AC) cycles back and forth Corriente alterna (AC) ciclos de ida y vuelta  Efficient method for transmission of electricity• Direct Current (DC) travels in one direction• DC is required by most electronic devices  Rectifier: device that converts alternating current to direct current dispositivo que convierte la corriente alterna a corriente directa  Transformer: a device that changes the ratio of current to voltage un dispositivo que cambia la relación de corriente a voltaje 3
  4. 4. AC and DC (continued) 4
  5. 5. Hot, Neutral and Ground (continued) 5
  6. 6. Some Common Electronic Components• Transistor: gate or switch for electrical signal that can amplify flow of electricity puerta o el interruptor de la señal eléctrica que puede amplificar el flujo de electricidad• Capacitor: can hold electrical charge and smooth the uneven flow of electricity puede almacenar carga eléctrica y facilitan el flujo irregular de la electricidad• Diode: allows electricity to flow in one direction; can be used to convert AC to DC permite que la electricidad fluya en una dirección, se puede utilizar para convertir CA en CC• Resistor: limits amount of current that can flow through it limita la cantidad de corriente que puede fluir a través de ella 6
  7. 7. Some Common Electronic Components (continued) 7
  8. 8. Protecting Your Computer• Static Electricity  Control devices • Ground bracelet or static strap • Ground mats • Static shielding bags  Touch computer case or power supply before you touch a component 8
  9. 9. Protecting Your Computer (continued) 9
  10. 10. Protecting Your Computer (continued) 10
  11. 11. Protecting Your Computer (continued) 11
  12. 12. Surge Protection and Battery Backup• Surge Suppressors• Power Conditioners• Uninterruptible Power Supply• The Smart UPS 12
  13. 13. Surge Suppressors• Provides row of power outlets and on/off switch that protects from overvoltages on AC power lines and telephone lines Proporciona fila de tomas de corriente y de encendido / apagado, que protege contra sobretensiones en las líneas de energía AC y las líneas telefónicas 13
  14. 14. Power Conditioners• Provide protection against spikes• Also regulate or condition power También regulan o condiciionan la potencia• Provide continuous voltage during brownouts 14
  15. 15. Uninterruptible Power Supply • Provides backup power when AC fails • Offers some filtering of the AC • Conditions line for both brownouts and spikes • Protects against very high spikes that could damage equipment 15
  16. 16. Uninterruptible Power Supply (continued) 16
  17. 17. The Smart UPS• Controlled by software through USB or parallel port connection to PC• Offers diagnosis of UPS• Monitors quality of electricity received• Monitor % of load carried during a blackout• Send shutdown alarms during blackout• Remote startup of system through phone lines 17
  18. 18. What to Consider When Buying a UPS • Cost • Battery charger operation • UPS rating compared to total VA or wattage output • Degree of line conditioning • Warranty and service policies • Guarantee 18
  19. 19. What to Consider When Buying a UPS (continued) 19
  20. 20. The Computer Case and Form Factors• Form factors describe the size, shape and general makeup of a hardware component• Form factors of motherboard, power supply and case must match 20
  21. 21. The Computer Case and Form Factors (continued)• Matching form factors assures:  Motherboard fits the case  Power supply provides correct voltage and connects to the board  Holes in motherboard align with case  Holes in case align with ports in motherboard  For some form factors, wires for switches and lights match with connections on motherboard 21
  22. 22. Case, Power Supply, andMotherboard Form Factors• Form Factor• Baby AT Form Factor• ATX Form Factor• NLX Form Factor 22
  23. 23. AT Form Factor• Motherboard measures 12” x 13.8”• Cannot be used with smaller AT cases or newer ATX cases• Difficult to install, service and upgrade• CPU is placed on motherboard in front of expansion slots  Limits card length• Two power connections• Not widely produced today 23
  24. 24. Case, Power Supply andMotherboard Form Factors (continued) 24
  25. 25. Case, Power Supply andMotherboard Form Factors (continued) 25
  26. 26. Baby AT Form Factor• Fits many cases, including newer ATX• Size is 13” x 8.7”• Industry standard 1993 to 1997• Power supply blew air out of case 26
  27. 27. ATX Form Factor• Most common, open, nonproprietary configuration developed by Intel in 1995• Measures 12” x 9.6”• Power supply and motherboard use a single power connector, the P1 connector• Power supply blows air out of case 27
  28. 28. ATX Form Factor (continued) 28
  29. 29. NLX Form Factor• Low-end personal computer motherboards• Low-profile cases• Motherboard has only one expansion slot• Designed to be flexible and use space efficiently 29
  30. 30. NLX Form Factor (continued) 30
  31. 31. Types of Cases• Desktop Cases• Tower Cases• Notebook Cases 31
  32. 32. Desktop Cases• Classic case with four drive bays and six expansion slots• Motherboard is on bottom of case• Power supply is near the back 32
  33. 33. Desktop Cases (continued) 33
  34. 34. Tower Cases• Often used for servers and PCs users anticipating upgrading• Maximum space for working and moving components• Midsize, or miditowers, are most popular  Six expansion slots, four drive bays• Minitower, or microtower, is the smallest  Does not provide room for expansion 34
  35. 35. Tower Cases (continued) 35
  36. 36. Tower Cases (continued) 36
  37. 37. Notebook Cases• Portable computers with all components of a desktop computer• Difficulties in expansion• Designs are often highly proprietary• Designs focus on  Conserving space  Portability  Use of less power  Producing less heat 37
  38. 38. Cases (continued) 38
  39. 39. Detecting and CorrectingPower Supply Problems• Upgrading Your Power Supply  May be necessary when adding new devices • Run new devices at same time • Look for errors when both are working at same time  Estimate total wattage by adding required amount for each device together 39
  40. 40. Introduction to Troubleshooting • Determine if PC boots properly • Look for error messages • If boot is ok, troubleshoot from there 40
  41. 41. Introduction to Troubleshooting (continued) 41
  42. 42. Troubleshooting the Power System• Odors, connections and power, loose cables• Switches on: Computer, Monitor, Surge protector, UPS, Circuit breaker, wall outlet• If the fan is not running 1. Turn computer off 2. Open 3. Check connections to power supply 42
  43. 43. Troubleshooting the Power System (continued) 43
  44. 44. Power Problems with the Motherboard• Motherboard should be grounded to chassis• Short may be problem with electrical system  Component on board making improper contact with chassis• Look for damage on bottom of board• Frayed wires can cause shorts Cables pelados pueden causar cortocircuitos 44
  45. 45. Overheating• If computer hangs after running for a while, it may be an overheating problem• Check airflow in the case• Check vents of the case• Use CMOS to check the temperature 45
  46. 46. Overheating (continued) 46
  47. 47. Overheating (continued) 47
  48. 48. Overheating (continued) 48
  49. 49. Power Management Methods and Features 49