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A television produces a series of tiny dots on a screen that,
when seen as a whole, appear as an image.
Older televisions rely on a cathode-ray tube to produce images,
and operate with an analog signal.
As technology has advanced and broadcast signals transitioned
from analog to digital,
plasma and LCD (liquid crystal display) televisions were created.

These TVs are more compact and have crisper pictures
than their cathode-ray counterparts because
they use a thin grid of pixels to create images rather than
a vacuum tube.

The tiny dots of light produced on the TV screen,
called pixels, flash according to a specific pattern provided by the video signal.
A person's eyes transmit this pattern to the brain,
where it is interpreted as a recognizable image.

The television set refreshes these patterns hundreds of times per second
— faster than the human eye can see
— which gives the illusion of movement

The transmitter transmits both the video and audio signals over the air waves
.Both audio and video signals are electrical in nature
and are transformed into radio waves
which can then be picked up by receivers (your TV set).
A transmitter not only transmits one channels audio or video signal,
but in most cases many different channels.

Receiver (TV set)

A receiver is usually integrated in your TV set and

this receiver is able to grab radio waves (the

transmitted signal) and process these radio

waves back to audio and video electric signals

that can now be played on your TV set.

Microwaves have a frequency that can penetrate water, fat,
and sugar molecules and excite them.
For a molecule to be excited the electrons "orbiting"
the nucleus have to jump up energy levels.
When this occurs the atom starts to vibrate faster than normal.

When this happens in a glass of water for example,
all the atoms that makes up water start to move
and run into each other and create friction.
When friction is created energy is given off in the form of heat.

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This book was created and published on StoryJumper™

Publish your own children's book:

www.storyjumper.com

These TVs are more compact and have crisper pictures
than their cathode-ray counterparts because
they use a thin grid of pixels to create images rather than
a vacuum tube.