What are the Personal Computers (PCs) ?
Tablets,Laptops and Notebooks, Wearables(apple watch), Desktop Computers
What are the other computing Devices?
Mainframe: Large computers for multiple users and to store large amounts of Data.
Supercomputer: Designed for complex calculations and models. Fewer programs with faster results.
What are the components of Computers?
What are the 4 main functions of an computer?
Give 5 types of input?
1) Text; Keyboards,Qwerty,flexible,virtual,Touchscreens
2)Point: Optical Mouse,Tackpads, Game, controllers,joysticks,game pads, steering wheels, Microsft Kinect, Wii
3) Audio Visual: Camera, Cameracorders,cell phones
4) Point: Optical Mouse, Trackpads, Game controllers, Joysticks, gamepads, steering wheels
5) Image: Scanners, Sensors, Gesture recognition technology, Magnetic stripe readers
What are the outputs?
Screen Type: Monitor, LCD(Liquid Crystal Display), LED( Light-emitting diode), OLED Displays( Organica Light-Emitting Diode)
Other Output Devices: Flexible Displays, Retinal Scanning Displays, Video Projectors, Speakers, Headsets, sound equipment
Printers: Inkjet printers (Sprays small drops of ink onto paper known as a nonimpact printer), Laser printers (uses lasers and static electricity), all-in-one printers (print,scan,copy,fax),Plotters (uses computer-controlled pens for oversized images, blueprints, schematics) big billboards, Thermal printer (melt wax into paper or burn dots into special paper)
What is the CPU?
- The brain of the computer controls all the functions
- Contains registers and cache memory
- Speed is measured in Hertz(HZ), generally in Gigahertz for CPUs (ghZ0
- Dual Processor= 2 CPU in the computer, Quad-Processor=4 CPU’s
What is RAM?
Random Access Memory
- Temporary(Volatile)
- Run programs when the computer is on
- Adding RAM lets you do more things at the same time
- Daily Activity-you can listen to music, study, and chaton facebook at the same time…but then you go to sleep you can stop doing all these activities
What is ROM?
Read-Only Memory
- Permanent (NON-VOLATILE)
- Start the computer
- Adding ROM has little impact on processing speed
- It’s like vital function such as breathing it doesn’t need to be thought about
How is storage works?
1) Mechanical Hard Drive (HDD):
Moving part
- Platter: Round thin plates inside the HDD housing magnetized spots that represent data.
- Access Times: The time it takes to find data on the HDD
2) Solid State Drives (SSD)
- not moving part
- Max storage: Around 4 TB(but very expensive)
- No moving parts, no noise,little heat,less power
- Faster Access times (100x faster than HDD)
- Allows computer to start faster->many computers put the OS on an SSD
3) Flash Moving Devices
- No moving part, uses flash memory, uses less power(USB key)
4) Optical drives
- use lasers to store and read data on optical media (ex CD,DVD…)
- Precorded: CD-ROM,DVD-ROM,BD-ROM
- Recordable:CD-R, DVD-R,BD-R
- Rewritable: CD-RW,DVD-R,BD-R
- Less and less common,especially in portable devices
How to measure a computer data ?
The language is BINARY CODE which consists of 1 and 0.(each 1 and 0 is 1 bit)
Bits are organized into groups of 8 called BYTES. 8 bits= 1 byte (each character is represented by a byte)
coller tableau
What is Moore’s Law?
It’s the number of transistors per square inch on electronicchips is roughly doubling every 18 months or so which leads to…
- Computer speed increasing exponentially (not at a stable rate,but still continously)
- Mobile platforms and Internet access is growing worlwide
- Data storage and Data communication costs virtually 0$
- Routine tasks can be outsourced cheaply-If your job can be automated you job isn’t secure
(18 months)
