I have followed this thread for a bit, and I think you may be being a bit
hard on ram27. He may be a student trying to find an easy way of doing
homework, or he may simply be trying to stir us up, but the questions that he
is asking are not easy to answer unless one only considers a pure single
frequency.
As recently as 1999 there were a series of 3 long papers by F Ghassemi
discuss what the definition of power factor should be under modern conditions
where waveforms are distorted.
What ram27 needs to tell us is the background to his question, whether he is
following a couurse of study, or whether he is simply trying to educate
himself, and looking for a different approach that will give him a feel of
what capacitance for example is.
John
I am assuming your post was ment for me.
I wasn't attempting to "be Hard" on him/her.
I know how difficult this subject can be for a student, it was
difficult for me also.
If ram27 were to post a question like "I don't understand the
relationship of true power to relative power" then I would most
certainly try to help.
Spoon feed answers to homework questions I will not do. :)
yes sir..you are right..i am pursuing my bachelors degree here in
India..i need myself to get strong enough the basics so that
everything would become easy..and more over i need concept behind it
in short why does this happen,.....all sort of WH questions...i have a
number of books giving those definitions but not the concepts
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No kidding- then take the text material and think about it and put it in
your own words.
Oops, considering the English usage above, that could be a problem.
--
Don Kelly snipped-for-privacy@shawcross.ca
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Don, I have invariably agreed with your understanding of the concepts
of Electrical Engineering and indeed have learned a great deal from
your contributions to this group over the years. However, as a former
'Teacher of English as a Foreign Language' I think you are being a bit
hard on good old Ram...his English ain't so bad, even if it is a
little quaint....nevertheless after visiting India 18 months ago and
returning with about 12 absolutely excellent texts on Electrical
Engineering which are difficult to obtain outside India (and very
inexpensive for the western pocket also) AND given the fact the
subcontinent seems to produce a disproportionately high number of
power engineers, some excellent, some good, some average and some not
so good (same as everywhere else), I do find it hard to believe that
Ram cannot find his answers at a more local level. Any good basic elec
eng text book should explain these terms...go to a local tech college
or university library ...the trick is to flick through some books and
see which seems to make sense for you...maybe with diagrams and/or
pretty pictures that will give you a feel for the subject...once you
get a grip on these concepts the explanations in the other textbooks
usually become clearer also...and give one a still deeper multi-
leveled understanding as a result. Good luck.
Don, I have invariably agreed with your understanding of the concepts
of Electrical Engineering and indeed have learned a great deal from
your contributions to this group over the years. However, as a former
'Teacher of English as a Foreign Language' I think you are being a bit
hard on good old Ram...his English ain't so bad, even if it is a
little quaint....nevertheless after visiting India 18 months ago and
returning with about 12 absolutely excellent texts on Electrical
Engineering which are difficult to obtain outside India (and very
inexpensive for the western pocket also) AND given the fact the
subcontinent seems to produce a disproportionately high number of
power engineers, some excellent, some good, some average and some not
so good (same as everywhere else), I do find it hard to believe that
Ram cannot find his answers at a more local level. Any good basic elec
eng text book should explain these terms...go to a local tech college
or university library ...the trick is to flick through some books and
see which seems to make sense for you...maybe with diagrams and/or
pretty pictures that will give you a feel for the subject...once you
get a grip on these concepts the explanations in the other textbooks
usually become clearer also...and give one a still deeper multi-
leveled understanding as a result. Good luck.
-----------
I have known many students from India as well as academic colleages from
there. Based on my experience with these- the " i know all these stuffs
man..what i need is some thing part from the
text book..thats i need it" simply doesn't fit in with the dialect of
English that is common to Indian students (which is superior to the sample
quoted above which appears to be closer to North American rap than to
anything out of India). Nor does it fit in with what they actually know.
Some do have a problem with the interface between theory and practice but,
on the whole, most do well.
We agree with regard to that and with respect to available references.
The point is that if he, regardless of his origin, which I don't know,
"know all these stuffs" he wouldn't need to ask for some "thing part from
the text book"
My problem is not so much the language but the apparent actual lack of
understanding that led to his message. The language issue comes in when one
who "knows..." cannot express his problem in a way that allows one to give a
useful answer.
The primary advice that I suggested is "think" Then ask "why?" "Why" is a
wonderfully legitimate (and often embarrassing for the questionee) question
which was not asked.
--
Don Kelly snipped-for-privacy@shawcross.ca
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I suspect we're seeing different levels of meaning of the verb "to
know". In different contexts, when someone says "I know X", they might
mean:
1. I can recite the definitions in the textbook, but I don't really
understand how they apply to problems.
2. I understand the definitions, and how to apply them to problems.
3. I understand this stuff well enough to use it, and to explain it to
someone else via several different approaches to the material.
Some might argue that you don't *really* know a subject until you can
say #3 above, but #2 is really all that's necessary for the student in a
course. However, I think the original poster is suggesting that they
know only #1, and want sufficient additional explanation to enable them
to get to stage #2.
Dave
--------------------
Fair enough. You may very well be right on target. If the person is at step
1. then he/she does need help. It might be useful it he/she then asked
questions regarding each factor- I suggest starting with 2 and 3 inductance
and capacitance (I find Bob G's "frequency dependent resistor" approach to
be fraught with problems leading to erroneous ideas ), and some information
as to what he knows and what he has problems with. What I would like to
see from Ram is something that can give a hint as to what is his problem- so
far there is nothing so I can only guess that it may be a problem with the
concept of phasors.
--
Don Kelly snipped-for-privacy@shawcross.ca
remove the X to answer
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