Wednesday, 8 April 2015

Problems with fracking

This presentation is against fracking and hope you like it.


Our teacher of tecnology told us to post in the blog a presentation we have done about hydraulic fracking and we hope you like it.

Hidraulic frackin from margatecnojaime

Monday, 16 March 2015


Adrián Álvarez Gallardo                                                           Ángel Barrios Montero


  • What is a capacitor?
  • Dielectric insulator
  • History
  • Theory of operation
  • Hydraulic analogy



A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store energy electrostatically in an electric field.The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (insulator). 

Capacitors (7189597135).jpg



A dielectric or insulator is a material that prevents the passage of current, and its function is to increase the capacitance of the capacitor.

The different materials used as dielectric permittivity has varying degrees of (different capacity for establishing an electric field).

Permitividad relativa de materiales aislantes - Electrónica Unicrom
Relative permittivity of insulating materials - Electronics Area

The higher the permittivity, the greater the capacity of capacitor.

The capacitance of a capacitor is given by the formula:
Er = C x A / d

- C = capacity
- Er = permittivity
- A = area between plates
- D = distance between the plates

The unit of measurement is the farad. There submultiples as miliFaradio (mF), microfarad (uF), the nanofarad (nF) and picoFarad (pF)

The main electrical characteristics of a capacitor are capacity or capacitance between plates maximum voltage (maximum voltage that is able to withstand without damage).

 In October 1745, Ewald Georg von Kleist of Pomerania, Germany, found that charge could be stored by connecting a high-voltage electrostatic generator by a wire to a volume of water in a hand-held glass jar. Von Kleist's hand and the water acted as conductors, and the jar as a dielectric (although details of the mechanism were incorrectly identified at the time). Von Kleist found that touching the wire resulted in a powerful spark, much more painful than that obtained from an electrostatic machine. The following year, the Dutch physicist Pieter van Musschenbroek invented a similar capacitor, which was named the Leyden jar, after the University of Leiden where he worked.


  A capacitor consists of two conductors separated by a non-conductive region. The non-conductive region is called the dielectric. In simpler terms, the dielectric is just an electrical insulator.

Charge separation in a parallel-plate capacitor causes an internal electric field. A dielectric (orange) reduces the field and increases the capacitance.


In the hydraulic analogy, charge carriers flowing through a wire are analogous to water flowing through a pipe. A capacitor is like a rubber membrane sealed inside a pipe. Water molecules cannot pass through the membrane, but some water can move by stretching the membrane.

In the hydraulic analogy, a capacitor is analogous to a rubber membrane sealed inside a pipe. This animation illustrates a membrane being repeatedly stretched and un-stretched by the flow of water, which is analogous to a capacitor being repeatedly charged and discharged by the flow of charge.

Saturday, 3 January 2015


We are students of 3rd E.S.O. and we want to explain how a program or application for GPS Navigator is designed by TOMTOM to go from point A to point B by car on the best route.


In 2004 the first TOMTOM browser came as hardware. Right now there are 109 navigable countries.

To make this program uses existing street, city maps, orthophotos and satellite images.The maps are redrawn schematically in digital format. This is the first layer. Another layer becomes more above: the names of streets, signs (including information on maximum speed, senses movement of the streets, speed radars, direction boards, etc), the numbers of the streets and points of interest, relief and finally monuments and unique elements.
And to make this work you have to move to the place you are mapping with "Mobile Mapping"

This is a van carrying a diferential GPS, camera 360º, a laser scanner, a 3D gyroscope, an odometer and a computer to record all data should complement the map is used. 
The laser scanner generates a three-dimensional image points of the enviroment by passing the van.
Also is the information transmitted GPS navigators position themselves.

When maps are released to users all participate with their data.Then you can know where it has gone that browser, which took effect or how fast passed. All these data are displayed with a web tool called " Cartopía".

This tool checks the layout of the streets and roads according to the map. If there are errors, we proceed to correct them. It also checks wether the directions of movement are correct, if there are roundabouts, even if there are new streets that are not on the map and thanks to a GPS pased by and left the trail.


Wednesday, 10 December 2014


The fault in wikipedia is that it is user generated content, and as a result it´s content is not always correct.
Announce the death of personalities before time.
For example: Tony Blair and Fidel Castro
Wikipedia says that the football player David Beckham was a chinese goalkeeper of the XVIII century.

Obviously this is a lie.

There is an article in wikipedia which says that Platon,a disciple of Sócrates and a greek philosophist was a hawaiian surfist and an editor of the phemenin magazin ´´Cosmogirl´´. 

Someone with too much free time added one of the most vile lies that can be said about Gary Oldman, actor who played Commissioner Gordon in the films "Batman Begins" and "The Dark Knight".In 2010, Oldman biography of the collaborative encyclopedia stated that, according to doctors, he was a giraffe.

For more information check this website: