یادگیری الکترونیکی

How Do Cell Phones Work? Electromagnetic waves and Mobile Switching Centers – 3D Animation

Mobile phones played a fundamental role in telecommunications and now are essential devices in everyday life.

But how come, a so small device allows us to communicate with any person around the word, no matter where we are?

In this video we will...

What is a submersible pump and how it works

The submersible pump is a particular type of centrifugal pump used to move fluids from one point to another or to favor their ascent to the surface.

This hydraulic device can be used, for example, to empty a flooded area, but also to empty or fill a swimming pool or recover and bring to the surface the water contained in a well.
...