A bit of help with KCL and ohms law please

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Discussion Overview

The discussion revolves around the application of Kirchhoff's Current Law (KCL) and Ohm's Law in solving a circuit problem. Participants are reviewing calculations related to voltage and current in a circuit with resistors, seeking validation of their reasoning and answers.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents their calculations using KCL and Ohm's Law, providing specific answers for different parts of the problem.
  • Another participant notes the absence of an attached picture, which is crucial for understanding the problem.
  • A later reply confirms that the initial calculations for the first two parts appear correct.
  • There is a question about finding the voltage across a resistor given its resistance and current, prompting a discussion on the use of Ohm's Law.
  • Subsequent responses include proposed voltage values based on the calculations discussed.

Areas of Agreement / Disagreement

Participants generally agree on the correctness of the initial calculations for the first two parts, but there is ongoing discussion about the subsequent calculations and the application of Ohm's Law, indicating some uncertainty.

Contextual Notes

The discussion lacks clarity on the specific circuit configuration and the values of the resistors involved, which may affect the calculations. Additionally, the absence of the initial image may limit full understanding of the problem.

Who May Find This Useful

Students or individuals studying circuit analysis, particularly those looking for assistance with KCL and Ohm's Law applications in homework scenarios.

twister16th
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i have attached a picture showing the problem;
just wanting to know if my working out and reasoning is correct please.

http://img29.imageshack.us/img29/5412/questionsq.jpg

The Attempt at a Solution


i have used KCL to answer (a) and (b) and have answers 0.6 and 1 respectively.

for (c) and (d) i have used the equation v1=r1/(r1+r2)*v
and have answers 1 and 5 repectively.

for (e) i used power equation p=VI where V is 6 and I is 1 and have the answer 6.
thanks in advance for any help i get :)
 
Last edited by a moderator:
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I see no picture.
 
ah sorry, it appears on mine, if not here is the direct link.


http://img29.imageshack.us/img29/5412/questionsq.jpg
 
Last edited by a moderator:
The first two look OK.

What is the voltage across a resistor if it is 12 K and it has 0.4 mA flowing in it?
 
as in use Ohm's law to find it out?
 
Yes, you can see two resistors that add up to 12 K.

You need the total voltage across them.
 
so v1=0.8 and v2 =4.0?
oh and thankyou for your help :), its really appreciated.
 

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