THE LEYDEN JAR

Presentation Good morning to everybody, we are

three Haig school students doing a technological processes.

The members of the group are: Gerard, Ariadna and Oriol.

Now we are going to talk about our project

Our project is: THE LEYDEN JAR

DEFINITIONThe Leyden jar is a capacitor and an electronic device that is used to store electrical energy. They are only used to store the electrons and they are not capable of producing them.

INVENTION OF THE CAPACITOR Ewald Georg von Kleist

There are many stories behind the invention of the capacitor. A German scientist named Ewald Georg von Kleist was known to invent the capacitor in November 1745. But, he did not have any detailed notes or records of his invention. So, he was given the credit for evolution of the capacitor.

Ewald Georg von Kleist

PIETER VAN MUSSCHENBROEK

A few months later a Dutch professor called Pieter van Musschenbroek found a similar device called the Leyden Jar. Scientists approved this to be the first capacitor. After years, both the scientists have been given equal credit for the invention of the capacitor.

Pieter Van Musschenbroek

Benjamin Franklin

Years later, Benjamin Franklin experimented with the Leyden Jar, and was able to make a smaller capacitor which was named as Franklin Square after him. Later English chemist Michael Faraday began experimenting on the Leyden Jar, and invented the first commercial capacitor. This capacitor was made from large oil barrels. This was later progressed in such a way that electric power could be delivered to very large distances.

Benjamin Franklin Michael Faraday

THE LAYDEN JARThe Leyden Jar basically consists of a glass jar, which was lined inside and outside with metal foils usually made of lead. The glass jar was half filled with water. The glass jar was used as the dielectric. A brass rod is introduced from the top of the glass jar. A static supply was then given from the brass rod into the jar. When this is delivered the jar will store two equal, but opposite charges in equilibrium which passes on to the ground if a ground wire is given. The figure of a Leyden Jar is given below.

WORING OF A CAPACITOR

A capacitor is defined by the type of dielectric selected. It also defines the application of the capacitor. According to the size and type of dielectric used, the capacitor can be used for high-voltage as well as low-voltage applications. For applications in radio tuning circuits air is commonly used as the dielectric. Take a look at the figure given below to know about dielectric in a capacitor:

The Parts of a leyden Jar

HOW TO MAKE A LEYDEN JAR

http://www.youtube.com/watch?v=MlitL7u0FpU&feature=endscreen&NR=1

Personal Evaluation and Conclusions

EndThanks you for your attention

Ariadna- Gerard- Oriol