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Post by ABC Singh on Oct 26, 2014 22:24:46 GMT 5.5
Sir/Madam,
"Describe the drift velocity" I know something that the force which gives to one electron. But it is not enough. When I seach in the internet, I cannot know writting language in the internet such as formula establish.
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Post by Thoithoi O'Cottage on Oct 28, 2014 22:32:49 GMT 5.5
Many thanks for posting, abc. This is interesting. Again, despite an interest in physics still burning (I wanted to be a physicist, though, without the wherewithal, I had to let the hope go ☺ ), I am no more the right person to take part in a physics discussion. However, for the same reason as I put in my comment on your mathematics query a couple of days ago, I am participating in this. I know my reply is not comprehensive at all. It may not even satisfy your quriosity. More than that, it may not even be strictly correct. If my memory serves me well, electrons in an an open-circuit body, say a cylindrical metal rod, remain as free electrons behaving like gas molecules in a container turning randomly toward every direction. When the circuit is closed, due to the electric field the free electrons attain a direction and begin to flow--they turn toward left and run from the higher potential terminal to the lower potential terminal at certain (variable) speed. The speed with direction of these electrons are called the drift velocity of these electrons. "Drift" literally and roughly means "flow" or "current," and "velocity" means speed with direction, which is a vector. Thus, drift velocity literally means the speed of electrons when they flow in their direction. Slightly technically, you can say drift velocity is the speed at which electrons move around a circuit, that is, their net velocity ignoring all the random motion of the electrons within the cloud. If my explanation is not clear, I believe this source may make it clear: resources.schoolscience.co.uk/CDA/16plus/copelech2pg3.html. If you still find it difficult to understand the matetial at that link, kindly let me know. Let us interact more on this and I am sure you will finally understand it quite easily. |
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Post by Thoithoi O'Cottage on Oct 30, 2014 19:34:02 GMT 5.5
You will be able to establish a formula to calculate drift velocity independently if you understand the concept thoroughly. Thinking really pays, of course.
While you will not have spent in vain the time invested in thinking (that's really good), it is also essential to study the formula already in use to help you sooner understand the details, thereby updating yourself on the standard.
The page at the link I've provided above guides you through the steps pretty plainly.
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