Lee Weiner 572-6025 email@example.com 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