CIT 141 – PC/Networking Fundamentals

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## CIT 141 – PC/Networking Fundamentals

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**Lee Weiner**572-6025 weinerl@nku.edu CIT 141 – PC/Networking Fundamentals**Course Topics**Electricity Fundamentals How a PC works PC Components Assembling a PC System and Application Software Troubleshooting Hardware**Chapter 1 - Introduction**• Introduction to Computers and Computer Systems • Introduction to Networks • Basic Electricity • Numbering Systems • Lab Safety**Computers & Computer Systems**A computer is hardware A Computer System is the combination of hardware and software System Software Application Software**Three Types of Computers**Mainframes – Large, fast, used by corporations and scientific organizations (Thousands of users) Minicomputers – Medium sized companies and field offices (Hundreds of users) Personal Computers – Small (Single user or small group of users)**Definition of a Network**Two or more computers connected together to share information and resources. A network can span a room, a building, a campus, or the planet.**Basic Electricity**Two types of electric current Alternating Current (AC) – The kind that comes out of the wall Direct Current (DC) – The kind that comes from a battery. Most devices need DC, but most power supplied is AC.**Alternating Current**• The 120 volt, 60 Hz current that comes out of the wall actually varies from 169 volts to -169 volts sixty times a second. • 120 is the calculated RMS voltage.**DC Power Supplies**Power supplies perform two functions Transformation – Stepping down the voltage. Rectification – Converting AC to DC**Transformation**• Only AC can be transformed, because the process uses the expanding and collapsing magnetic fields caused by the increasing and decreasing current.**Rectification**AC is rectified using a diode, a device that allows current flow in only one direction.**Filtering**A capacitor is used to fill in the no-current time slots.**Numbering Systems**Our everyday number system is the decimal system. (Base 10) Each digit represents a power of 10. 2645**Numbering Systems**Our everyday number system is the decimal system. (Base 10) Each digit represents a power of 10. 103 102 101 100 2645**Numbering Systems**In IT, we sometimes count in two other numbering systems: Binary – Base 2 Hexadecimal – Base 16 23 22 21 20 163 162 161 160 1011 3F6A**Lab Safety**Use the wrist strap to neutralize ESD Remove all jewelry Roll up long sleeves (Clothing can hold ESD) Use the proper tools for each task Handle components by the edge