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Getting Ready for OHS
Open Heart Surgery!
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What’s a PC?
• Personal Computer– These computers were originally designed by
IBM in the 70s.
• Your computer at home is a PC.
• The workstations at KLDCS are PCs.
• Someone who uses a PC is called a USER
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PC Parts (External)
• Typically, PCs have a Monitor, Tower (or case), a keyboard and a mouse.– Note: Anything you plug into the Tower is
called a “peripheral device” (mouse, speakers, keyboard…)
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PC Parts (Internal)
• There are 5 major components that make PCs work:– Hard Drive– CPU– RAM– Mother Board– Power Supply
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Hard Drive
• Stores data magnetically (This means it doesn't disappear when the computer is switched off)
• Can store very large quantities of data. (4 Tb+)
Read/write arm swings while the disks all spin
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Hard Drive 2
• Usually made of glass or aluminum with a magnetic coating.
Very Shiny, and must be kept perfectly clean!
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Hard Drive 3
Cons: • Relatively slow access time. (100 000 times
slower than RAM!)
Pros:• Cheap memory (0.0001 $/mb) • Non-volatile – This means you can turn the computer off and
you don’t loose your stuff.• NOTE: When you click “Save” you are putting your project on the
HD.
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CPU
• Central Processing Unit
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CPU 2
• Also Called a “Microprocessor”
• Everything that happens in a PC goes through the CPU. (just like your brain)
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CPU 3
• CPUs are made of billions of interconnected electric circuits.
• The speed of a CPU is measured in “Hertz” or “how many operations it can perform every second”
• A 2 GHz processor can do up 2 billion things each second!
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RAM
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RAM
• “Random Access Memory”
• It is REALLY fast memory right near the CPU
• It holds currently running programs
• Stores Data Electronically Volatile!
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RAM 2
• Computers these days have around 2-4 Gb of Ram.
• My first computer only had 1 Mb! That’s 2000 times less!
• Having more ram makes your computer faster, because less information needs to go out to the HD.
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Mother Board (MOBO)
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Mother Board
• The main circuit board in the PC.It Contains:- RAM- CPU- Video Card (Sends the signal to monitor)
- Sound Card (Sends a signal to the speakers)
- Much more!
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Mother Boards
• It is the mother board that determines what components you can put in your machine.
EX: If you want a fancy gaming video card, your mobo must be able to support it!
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Power Supply
• The power supply converts the 110v AC power from your wall into the very small amounts of power your computer needs to run.
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Summary of Components
• Hard drive– Non-volatile, stores info magnetically, very large storage device.
• CPU – The brain! Everything that a PC does goes through the CPU.
• RAM – Really fast memory right by the CPU– Stores data of currently running programs– Stores info electrically
• Mother Board– Brings all the PC parts together
• Power Supply– Converts household power to power a computer can use!