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Showing posts with label computer. Show all posts
Showing posts with label computer. Show all posts

Wednesday, 30 January 2019

January 30, 2019

A World Without Books

A World Without Books


. An irish novelist colm toibin one recounted a story about observing a cantonse man
sitting on a kowloon foot path reading a book.The man face was stern with concentration,
and his finger tracing thr line being read.

. At times the man expression would be disturbed in frustration at his progress.finally,the
reader look is very glorous. It does not matter whether is was
because of a sudden joy with the act of reading, or  revelation from ehat was written, or
delight at how the story possession.

. some thing deliciously private a connection between
him and therefore the author, between the $64000 world and therefore the world delineated upon the pages.

. There is a frequently asked question; what should the world be like without books this is very
question is absurd and depressing.it is invariably aforesaid that the newest technology signals the death
of the book. Decades ago, it was thought that the radio would place books.

. This fear has persisted throughout with the invertions of television and internet. But scenes like
that of cantonese man reading the book negate the notion that modern advances pose a threat to
reading.Books are themselves a from of technology that is spread over the pages and makes us delve
into the complexities of life.

. Literature is the story of humans. Is is the record of who we are, where we come from and where
we are going.books make us travel at large. during our journey, we are connected with humanity.
We identify ourselves with the characters we meet and learn wether we love,;oathe,fear or
flatter.

. They help US comprehend our faults and aspirations.They tell US United Nations agency may we tend to become if we tend to square measure
careful.Reading provides the deepest affiliation to the morals that build America human, and a part of a
large society.

. Books are a source of comfort ofr us. They are a safe shelter. Throughout human history man has
found peace in the written works. Books are bridges-through we contact us through the book
siciety.Those who read more are better prepared to face the world then those who dont read.

. Books are  provides many way. They joy of their touch, sound and fragrance is
immeasureable. The pleasure of their understanding is an addition to it.The sharing of a book
with friends is still another from a joy.

. It is important that we work to give every person the opportunity to enjoy boks as shelters,
sustenance,and roads forward. To imagine a world without books is to imagine a world through,
feeling,compassion,history or voice.

Monday, 28 January 2019

January 28, 2019

Current Through Metallic Conductor


Current Through Metallic Conductor;

The valance electrons in metals are not bound to the individual atoms but are free to move in metals. These electrons are called free electrons. The speed of randomly moving depend upon temperature. 

Motion Of Free electron metals:

The free electrons in metals are in random motion just like the molecules of the gas in the cantainer.

Current Through Metals When No Battery is Connected:

In this case.the rate at which free electrons pass throngh in from right to left in the same as the rate at which they pass from left to right.As a result,the current throngh the wire is zero.

Current Through Metals When Battery is Connected:

When the end of wire are connected to a battery,an electrons field is set up at every point within the wire.A force acts on the free electrons in a direction opposite to that electric field E.due to the applied field,the electron change their random motion in such a way that they drift slowly with a constant velocity in a direction opposite to the field. The velocity is called drift velocity.Hence,a current begins to flow through the conducter.

Drift Velocity:

The average constant speed with which free electrons drift (flow) when current flows through the conductor is called drift velocity.The drift velocity is of the order of 10m/sec or 1mm/ sec.

Acceleration Of Electrons:

The force experienced by the free electrons does not produce a net acceleration because the electrons keep on colliding with the atoms of the conducter. The overall effort of colliding is to transfer the energy of accelerating electrons to the lattice atoms.
Steady current is maintained is the wire when a constant potential difference is applied across it. It produces the necessary field e along the wire

Note:

The velocity of electrons at room temperature due to thermal motion is several hundred kilometers per second.