Capacitor Questions.

Discussion in 'Homework Help' started by Evilsanta31, Jan 29, 2015.

  1. Evilsanta31

    Thread Starter New Member

    Dec 29, 2014
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    Need some help with this question. I will post my answers that I think is correct and if anyone can see where Ive gone wrong it would be great if you could point it out.
     
  2. mjakov

    New Member

    Feb 13, 2014
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    Evilsanta31 likes this.
  3. Evilsanta31

    Thread Starter New Member

    Dec 29, 2014
    23
    0
    Sorry it's the third uploaded picture that I think we're the issues lie, I'm fairly confident on a,b and c parts of the question and its parts d and e were I think I've gone astray. I've posted up the question from my assignment and then the attempts at completing it. I'll try and put arrows to the offending items later when I'm finished work.
    Thanks Alan
     
  4. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,800
    831
    It is preferred, by the Forum, to always upload attachments here. Some hosting sites are intrusive (I don't know tinypic). Also, many times externally hosted pictures "disappear".
     
  5. Evilsanta31

    Thread Starter New Member

    Dec 29, 2014
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    [​IMG]This is the assignment question im working on.
    [​IMG] This is my attempt at A, B and C and think these are correct, I have added these in as answers may be needed for further parts.
    [​IMG] This photo is where I think I have got stuck, Im just checking everything is ok with these two before re-submitting it for marking as its the only question I got wrong. D ends at the scored out section and E begins below the scored out section.

    Thanks Alan
     
  6. WBahn

    Moderator

    Mar 31, 2012
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    Your work is cutoff in the image so we can't see your result, but it looks like you are doing fine. Specifically, you have noted that the voltage across the capacitor is also the voltage across the resistor (or the negative of it depending on how you assign your polarities, which you NEED to do and haven't, thus when you say Vr it is ambiguous as to what you actually mean).
     
  7. Evilsanta31

    Thread Starter New Member

    Dec 29, 2014
    23
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    Thanks, didn't realise the result was cut off, got an answer of 0.5v. I'll check and note my polarity, thanks again for your help.
     
  8. WBahn

    Moderator

    Mar 31, 2012
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    As a general rule, answers in engineering should be reported to three sig figs unless there is a specific reason to do otherwise. This one is close enough that most people will accept that unless they are trying to drive home working with sig figs.
     
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