0:02 everybody has seen a computer in fact we
0:04 use computers every day but how do they
0:07 work every computer follows a simple
0:08 series of events that helps make them
0:11 useful this starts with an input an
0:13 input is any information that goes into
0:15 a computer this might be the press of a
0:17 key a click of a button
0:19 video from a camera or even the
0:21 temperature of a thermometer devices
0:22 that provide information to a computer
0:25 are called input devices once the
0:26 computer has received this input it
0:28 spends a tiny fraction of a second
0:29 calculating what this information means
0:32 and how or need to respond this is
0:33 called processing and is done in the
0:35 computer system central processing unit
0:37 or CPU as soon as it finishes working
0:39 this out the computer often lets us know
0:41 by producing an output an output is a
0:43 way for the computer to communicate with
0:44 the outside world
0:46 this can include sounds pictures on a
0:48 screen or even movement over a robotic
0:50 part devices that a computer system used
0:52 to communicate are called output devices
0:54 you might be thinking ok that seems
0:56 pretty reasonable but how does a
0:57 computer know what to do
0:59 this is where programming comes into
1:02 play all computers use a special set of
1:04 instructions called programs that help
1:06 them to decide what to do these can be
1:08 very simple like in a calculator or very
1:10 complex like in a supercomputer and
1:11 without them your computer is a little
1:14 more than a brick the final part of the
1:16 puzzle is storage storage is used to
1:18 keep information for later use sometimes
1:20 data must be saved to storage and at
1:21 other times it needs to be retrieved
1:24 from storage devices that hold
1:25 information are called storage devices
1:28 in essence this is how a computer works
1:31 but let's look at some examples let's
1:32 say your video calling a friend the
1:34 input to your laptop is the video and
1:36 audio going through the webcam the
1:38 computer then processes the video and
1:40 audio breaking it into parts to send to
1:41 your friend when it reaches your
1:43 friend's computer its output onto their
1:44 screen as video and through their
1:48 speeches as audio but wait where did all
1:50 these special effects come from when
1:51 making the call you decided to play with
1:53 the video calling program and add some
1:54 filters to your video
1:56 this means a bit more work for the
1:58 processor but it's a lot more fun the
2:00 images for the filters are kept on your
2:02 computer storage and are opened as you
2:04 add them to the stream as another
2:07 example let's look at a calculator let's
2:08 say you press the 2 button on your
2:10 calculator this is the input the
2:12 calculator spends a fraction of a second
2:13 processing what it needs to do
2:15 then displays the number two on a screen
2:18 as an output if this seems a little
2:19 complicated you can think of it like
2:21 this input is how computer gets
2:23 information from the world allowing us
2:25 to communicate with the computer
2:27 processing is the computer calculating
2:29 order should do next output is the way
2:31 the computer can communicate with the
2:33 outside world including us programming
2:35 is the instructions given to a computer
2:37 so it knows how to process information
2:39 and storage is how a computer keeps
2:42 information for later use see if you can
2:44 think of some examples of input
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