Calculating AC Current with a 1.5e-6 F Capacitor: 1kHz vs 8kHz Frequencies

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Discussion Overview

The discussion revolves around calculating the amplitude of alternating current through a capacitor with a capacitance of 1.5e-6 F when connected to an AC generator at two different frequencies: 1 kHz and 8 kHz. Participants explore the implications of frequency on the current and the role of capacitive reactance in this context.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about how to approach the problem and what is being asked.
  • Another participant suggests using the formula \(\frac{1}{2 \pi f c}\) to calculate capacitive reactance, implying it may be relevant to finding the current.
  • A request is made for a complete solution to the problem, indicating a need for guidance on the steps involved.
  • Participants discuss the importance of following forum guidelines, including posting in the appropriate section for homework questions.
  • There is a repeated inquiry about how to properly post in the homework section, indicating confusion about forum procedures.
  • A participant emphasizes the significance of understanding the AC resistance of a capacitor and how frequency affects it, suggesting that this is a critical aspect of the discussion.

Areas of Agreement / Disagreement

Participants generally agree on the need for a structured approach to the problem and the importance of following forum guidelines. However, there is no consensus on how to proceed with the calculations or the implications of frequency on the current.

Contextual Notes

There are limitations in the discussion regarding the clarity of the problem statement and the assumptions about the participants' prior knowledge of AC circuits and capacitive reactance. The discussion also reflects a lack of resolution on how to effectively engage with the homework guidelines.

carrollitis
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A 1.5e-6 F capacitor is connected as in fig. 31-10 to an AC generator with Em=30 V. What is the amplitude of the resulting alternating current if the frequency of the emf is (a) 1kHz and (b) 8kHz?

I have no idea where to begin. I don't even know what they are asking for in this problem.
 
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Does [tex]\frac{1} {2 \pi f c}[/tex] help?
 
If you can show me how to do the entire problem that would be great.
 
PF guidelines are that you need to show your attempt at a solution.
Also you should have posted it in the homework section.
 
How do I do that?
 
carrollitis said:
How do I do that?

The homework section is located here:
https://www.physicsforums.com/forumdisplay.php?f=152
Post your homework questions in that section from now. Do not start another thread about this because I've already requested a move.

Tell us about the ac resistance of a capacitor and how frequency effects, if anything at all.
 
carrollitis said:
How do I do that?

NoTime said:
Does [tex]\frac{1} {2 \pi f c}[/tex] help?

Does this post from NoTime mean nothing at all to you?

It's a very big hint...
 

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