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Sunday, August 26, 2018

Friday, August 17, 2018

Evolution of Computers


First Generation (1940-1956)


    Image result for generation of computer png
  • Major Hardware Technology: Vacuum Tubes, Punch Cards
  • Used Machine language
  • High heat generation
  • Slow processing
  • Large in size
  • Not portable
  • Consumes a lot of electricity
  • Expensive
  • System Invented: ENIAC, UNIVAC, IBM704, EDVAC, EDSAC

Second Generation (1956-1963)

  • Major Hardware Technology: Transistors, Tape
  • Use of Assembly language
  • Smaller in siz
  • Less heat generation
  • Less power consumption

Tuesday, August 14, 2018

Shutdown, Sleep, Hibernate


Shutdown

when you finish your work with pc or no need or infrequently usage then you can shutdown the pc.
You should save your current works before shutting down
if not, you will permanently loss your current work.

Sleep

sleep is a power saving state that allows a computer to quickly resume full-power operation when you want to start working again.
In sleep mode, your current work is saved in the RAM.
Related image
It will consume less power and often disable hardware and suspend software to assist in reducing power consumption.
It the power is cut while sleep mode, most probably  it will lost your works where you left.
In hybrid sleep mode,with RAM it always save the current work to the hard disk for safe keeping in the event of power cut.

Image result for sleep mode icon png

Hibernate

Hibernate mode is almost the same thing as fully shutting down the PC, but it saves your place  to resume the next time you turn it on.
Instead of saving to your RAM like sleep mode, it saves straight to your hard disk so that there's no chance of losing anything if power is cut.
It takes bit longer than the sleep mode but it depends on the hard disk and RAM speed.

Friday, August 10, 2018

HTML5- Content models


Meta data
Content that sets up the presentation or behavior of the rest of the content. These elements are found in the head of the document.
Elements:
<base>, <link>, <meta>, <noscript>, <script>, <style>, <title>
Embedded
Content that imports other resources into the document.
Elements: 
<audio>,  <video>, <canvas>, <iframe>, <img>, <math>, <object>, <svg>
Interactive Content specifically intended for user interaction.
Elements:
<a>, <audio>, <video>, <button>, <details>, <embed>, <iframe>, <img>, <input>, <label>, <object>, <select>, <textarea>
Heading
Defines a section header.
Elements:
<h1>, <h2>, <h3>, <h4>, <h5>, <h6>, <hgroup>
Phrasing
This model has a number of inline level elements in common with HTML4.
Elements:
<img>, <span>, <strong>, <label>, <br />, <small>, <sub>, and more.
Flow
Contains the majority of HTML5 elements that would be included in the normal flow of the document.
Sectioning
Defines the scope of headings, content, navigation, and footers.
Elements:
<article>, <aside>, <nav>, <section>