Difference between revisions of "Portal:Science/From the forum"
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=== Sankranthi and Summer Solstice === | === Sankranthi and Summer Solstice === | ||
This is an interesting exchange on the dates of the Sankranthi festival and the calendar calculations. [[http://karnatakaeducation.org.in/KOER/en/index.php/Science:_From_the_forum#Sankranthi_and_summer_solstice Read More]] | This is an interesting exchange on the dates of the Sankranthi festival and the calendar calculations. [[http://karnatakaeducation.org.in/KOER/en/index.php/Science:_From_the_forum#Sankranthi_and_summer_solstice Read More]] | ||
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| + | ===. What actually is electric current? === | ||
| + | '''''Response 1:'''''Electrical current is a measure of the amount of electrical charge transferred per unit time. It represents the flow of electrons through a conductive material. The direction of electric current is opposite to the direction of electrons. | ||
| + | |||
| + | '''''Response 2:'''''It will be more apropriate to say that the electric field moves instead of the electrons. _ The electric current is- The movement of the electric field in the conductor not the electrons. We know that electricity almost moves in the speed of light. At this speed the electrons would get such a momentum that a small bent in the conductor, is enough to make electron to get out of the path because of inertia of linear motion. Think about it.( Needs discussion) | ||
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| + | '''''Response 3:''''' One way to think of this is to think of the electric field as an information field. | ||
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| + | Let us say we are in a large hall with a few exit doors. Once a programme is over everyone gets up and attempts to move towards the nearest exit. It is not that everyone gets up one after the other and goes to the door. The information to get up and move is communicated simultaneously. Similarly it is not that the tubelight glows because the electrons move from one end to another. We know that the drift velocity of the electrons is different and this is not what we call current. Rather information about how the electrons can move is communicated when the potential difference is applied. And this information travels at the speed of light. | ||
| + | |||
| + | Instead of electricity, it may be more accurate to say that the information is communicated across the electric field at the speed of light. | ||
| + | |||
| + | This understanding of the "field" concept as an information field is crucial to the understanding of electromagnetism. | ||
Revision as of 05:50, 5 June 2013
Some interesting exchanges from the STF mailing forum.
To join the forum, visit this group here.
Fun and magical science experiments in school
Contributed by Praveen Kamath (Kodagu), this is a compilation of simple and fun science experiments for school.
Some questions and answers on biology. [Read More]
Can scientists follow religious festivals
Read this interesting exchange on science teachers and religious observances. This was posted on the occasion of Varamahalakshmi Pooja.
Speed of light
A discussion on the nature of speed of light [Read More]
Sankranthi and Summer Solstice
This is an interesting exchange on the dates of the Sankranthi festival and the calendar calculations. [Read More]
. What actually is electric current?
Response 1:Electrical current is a measure of the amount of electrical charge transferred per unit time. It represents the flow of electrons through a conductive material. The direction of electric current is opposite to the direction of electrons.
Response 2:It will be more apropriate to say that the electric field moves instead of the electrons. _ The electric current is- The movement of the electric field in the conductor not the electrons. We know that electricity almost moves in the speed of light. At this speed the electrons would get such a momentum that a small bent in the conductor, is enough to make electron to get out of the path because of inertia of linear motion. Think about it.( Needs discussion)
Response 3: One way to think of this is to think of the electric field as an information field.
Let us say we are in a large hall with a few exit doors. Once a programme is over everyone gets up and attempts to move towards the nearest exit. It is not that everyone gets up one after the other and goes to the door. The information to get up and move is communicated simultaneously. Similarly it is not that the tubelight glows because the electrons move from one end to another. We know that the drift velocity of the electrons is different and this is not what we call current. Rather information about how the electrons can move is communicated when the potential difference is applied. And this information travels at the speed of light.
Instead of electricity, it may be more accurate to say that the information is communicated across the electric field at the speed of light.
This understanding of the "field" concept as an information field is crucial to the understanding of electromagnetism.