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Plus Two Physics

Electric Current and flow of electrons

I have read that the FLOW OF ELECTRONS is called electricity. I wanna know that what is meant by flow of electrons? Pleaz answer me…. (Asked Kiruthika) Answer: Electric current is the flow of charges. (Measured as the rate of flow of charges). In conductors electric current is caused by the flow of free electrons. When a potential difference is […]

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What do you mean by impedance of an antenna?

What do you mean by impedance of an antenna? (Asked Sims) Answer: In general, impedance is defined as the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance. An antenna’s impedance relates the voltage to the current at the input to the antenna.  The knowledge […]

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Plus Two Physics

What are Science Olympiads?

International Olympiads are held every year in Mathematics, Physics, Chemistry, Biology, Astronomy and Junior Science. Olympiads are internationally recognized competitions in various fields of knowledge. They are the highest level examinations and are hosted by different countries every year. Participation in any of the Olympiads has worldwide recognition and is considered as a great achievement. […]

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Plus Two Physics

LISTENING TO GANDHI – By Krishna Kumar

LISTENING TO GANDHI By Krishna Kumar, Excerpted from Seminar #436, December 1995 The field notes, on which this article is based, were collected by Snehlata Gupta and Malvika Rai under the auspices of a study assisted by the UNICEF Regional Office, Kathmandu. As the world approaches the close of this century, many ideas practised and preached […]