Monthly Archives: June 2012

Our Reflection

Through this project, we have learnt to work together harmoniously overcome difficulties. We faced lots of troubles like meeting up together and discussing about what to do and write for this blog. We realized that meeting up together is not necessary, we can just divide the work equally among each other based on our abilities. Also, we found out each other strengths and weaknesses, this really strengthens our friendship. We have to have faith in each other and stay united.

Besides that, we learnt more about the history of electromagnetism which is rarely taught in class. This project is very meaningful. Both of us,  are really inspired by Andre-Marie Ampere’s perseverance and hard work.

         

Inspired by Andre-Marie Ampere

Both of us are inspired by how Andre-Marie Ampere was able to do well in such an extent that he became one of the greatest scientists to make a great impact in the world although he did not attend school, and was also rumored to be so excellent in Mathematics at such a young age, and this we think it owed to his perseverance and determination.

Also, when he was influenced by another scientist back in 1820, he took the opportunity to discover more than what he knew. This is very inspiring to us as even though he did not attend school like how most people did, he was still able to excel more than the rest.

Andre-Marie Ampere’s Inventions

Andre-Marie Ampere realized that the deflection of a compass needle caused by an electric current flowing through could be use to measure the magnitude of the current.  This concept led to the development of the galvanometer.

Galvanometer is an instrument utilizing a free moving needle to measure the flow of electricity, where a free pivoting coil and an attached needle are placed in the magnetic field of a permanent magnet. When an electric current passes through the coil, it experiences a torque due to the interaction of the current with the magnetic field. As a result the coil pivots and the needle is deflected proportionally to the current passing through the coil.

Here’s a video to show you how the moving coil galvanometer works. Enjoy!

Andre-Marie Ampere’s Contributions to the Study of Electromagnetism

Andre-Marie Ampere work done in the field of Electromagnetism was his greatest contribution.

In September 1820 a Danish scientist, Hans Christian Orsted, produced some experimental results in the field of magnetism. Ampere influenced by his discovery, discovered the nature of the relationship between electric current-flow and magnetism, as well as the relationships of the behavior of electric currents in various types of conductors.

Besides that, Ampere showed that two parallel wires carrying electric currents magnetically attract to each other, if the currents are in the same direction and repel if the currents are in opposite directions.

This experiment led Ampere to formulate his law of electromagnetism, Ampere’s law, that describes mathematically the magnetic force between two electrical currents, which states that the mutual action of two lengths of current-carrying wire is proportional to their lengths and to the intensities of their currents.

Electric current passing through the wire creates magnetic lines of flux that encircle the wires.                                      Magnetic flux, through the surface which is the component of B field, passing through it. The circulating magnetic field, is a closed loop, in the electric current passing through the loop where is the magnetic field.

Thus, this made him the first person to develop measuring techniques for electricity. The ampere is the unit for measuring electric current.

Andre-Marie Ampere’s Biography

Andre-Marie Ampere was a French physicist  and mathematician who is known as one of the main discoverers of electromagnetism. The unit for measuring electric current, the ampere, was named after him. We will talk more about his contributions and inventions in the next posts.

He was born on 22 January 1775 and died on Jun 10 1836. Andre-Marie Ampere was mostly self educated as his father, Jean-Jacques Ampère, believed that young boys should avoid formal schooling and pursue an ‘direct from nature’ education. So, his father allows him to educate himself within the walls of his well-stocked library. In addition, Andre-Marie Ampere begin teaching himself advanced mathematics at the age 12.

Here are some pictures of Andre-Marie Ampere…

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