#### Grossel

##### Well-Known Member

Hi forum, fellow members.

I was lurking around on the net (in another forum I had to admit, please don't arrest me) and found a question about how to solve a capacitor charging when there was both a resistor and voltage follower in the mix. So using superposition or the theorem to make everything into current or voltage source would be on my short list to solve that particular problem. But then there was one clever dude suggesting using time domain math to solve the problem (that is voltage as function of time).

I obviously didn't post this thread to work out a basic RC circuit charging problem - I like to think of this post more like an myself-introduction kind of subject - that's why I choosed members lounge.

This story is from eleven years ago back in time, so I wouldn't remember much anyway since I don't have a job that I need to do this kind of math solving. The subject at scool spanned over two semesters.

Semester one: We had this very extreme smart teacher (Supa dupa IQ+++) and he started right away solving math equations. All the methods and rules was hammered into our student heads. But he forgot something very important - he acually spend one whole semester hammering on those rules and formulas but never ever was able to use any of this for electrical problem solving. Never - it was math only (I'm confident that the teacher has never dealt with anything involving electric circuits). Got very boring, and after all what purpose did this math anyway, I asked myself.

Semester two: Change of teacher. This one have teached electrical circuits hes whole career and was very able to explaining all the practical use for the math. That time - I understood that this was something that may come handy. But realized we started totally backwards, because by now we had only doing math solving without being demonstrated any practical use for the material.

Obviously I beleived the teacher for second semester was the greater one because he was able to use the time domain math to solve real solutions.

But - because of the swap of semesters in order of teaching methods, I feel I never got the real understanding of the material. Example - If I was told today to solve a very simple question of charging a RC circuit using time domain - I'm simply not capable to do that, I don't know where to start.

Say I want to spend some hours at home to refresh - where to go to start? I haven't got any book when at first semester, the teacher always used notes created on Powerpoint so they are to no use today.

[edit / ot]

Maybe it's time to do something to the avatar now, have had that weird resistor for a while. This new gui is a little to big to fit the size of an avatar.

I was lurking around on the net (in another forum I had to admit, please don't arrest me) and found a question about how to solve a capacitor charging when there was both a resistor and voltage follower in the mix. So using superposition or the theorem to make everything into current or voltage source would be on my short list to solve that particular problem. But then there was one clever dude suggesting using time domain math to solve the problem (that is voltage as function of time).

**Back to school - this is the actual problem**I obviously didn't post this thread to work out a basic RC circuit charging problem - I like to think of this post more like an myself-introduction kind of subject - that's why I choosed members lounge.

This story is from eleven years ago back in time, so I wouldn't remember much anyway since I don't have a job that I need to do this kind of math solving. The subject at scool spanned over two semesters.

Semester one: We had this very extreme smart teacher (Supa dupa IQ+++) and he started right away solving math equations. All the methods and rules was hammered into our student heads. But he forgot something very important - he acually spend one whole semester hammering on those rules and formulas but never ever was able to use any of this for electrical problem solving. Never - it was math only (I'm confident that the teacher has never dealt with anything involving electric circuits). Got very boring, and after all what purpose did this math anyway, I asked myself.

Semester two: Change of teacher. This one have teached electrical circuits hes whole career and was very able to explaining all the practical use for the math. That time - I understood that this was something that may come handy. But realized we started totally backwards, because by now we had only doing math solving without being demonstrated any practical use for the material.

Obviously I beleived the teacher for second semester was the greater one because he was able to use the time domain math to solve real solutions.

But - because of the swap of semesters in order of teaching methods, I feel I never got the real understanding of the material. Example - If I was told today to solve a very simple question of charging a RC circuit using time domain - I'm simply not capable to do that, I don't know where to start.

Say I want to spend some hours at home to refresh - where to go to start? I haven't got any book when at first semester, the teacher always used notes created on Powerpoint so they are to no use today.

[edit / ot]

Maybe it's time to do something to the avatar now, have had that weird resistor for a while. This new gui is a little to big to fit the size of an avatar.

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