My great Confusion in Physics Derivations.Help

[Aladin]

I am a student of intermediate and now a days we are studying Electricity.
I get confused when I sit to learn any topic of physics specially mathematical derivations.I cannot understand what formula is used and when will be used in this derivation.For Example:In "Capacitance of A Parallel plate Capacitor" topic first we used (E=sigma/epsilon not) then we used E=V/d.
now I confuse why we used these formulas.And mostly I cannot remember that which formula is used in this and that derivation? and somtimes I forget to apply them because there are many topics in which these formulas are used again and again so that these topics are mixed in my mind and I get confuse.
Please help me I will be thankful to you.It is a great problem of my study.
thanks.
If anyone have any site in which I can find all derivations with details of everystep and each step is defined whether what is reason to use this and that formula ,please tell me.
I wil be grateful to you.

 

[mathmike]

When I Got Confused About Something I Usually Read The Book,(not Saying You Havent), Or Asked The Instructor. But When All Else Fails Ask A Fellow Student In Your Class

 

[Aladin]

can I download this book from internet.?

 

[cepheid]

I'm pretty sure he means to look in whatever textbook you are using in your studies.

You know what I would recommend? You seem to be saying, I don't understand how it is that we *know* when to use a certain equation in a certain situation, and have trouble remembering them all so that I can pick the correct one of out all of them. My advice would be as follows: no matter how it seems to you now, physics is not about just memorizing equations and then remembering which ones are supposed to be used in different situations. You need to understand the concepts behind the equations. They don't just come out of nowhere. If you understand what they mean, and where they come from, then you won't have to memorize them, they'll just come to you automatically. Furthermore, you'll be able to identify which physical concept your homework question is testing you on, and then apply your knowledge to it. This can only come with study, and in fact is what studying physics in school is all about. I'm not sure how to tell you the best way to do that, that's more something you find out on your own. But as somebody pointed out, the explanations and derivations in your physics textbook are an excellent place to start. Remember...understanding the concepts is the key to solving the problems.

 

[fizixx]

That is GREAT advice Aladin. That is the essence of what you should do. Hopefully you will find a way to shift your study habits to accommodate that method of learning. Cephid did you a monumental favor there, and it was expressed so eloquently.

 

[fizixx]

"cepheid"