Why my solutions are wrong for this circuit problem?

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In summary, the conversation is about a problem with finding I2 and Vab using KVL. The person started with L1 on the left and assumed the current to be 3A. However, when applying KVL on L1, the current through R1 was found to be I1-I2, which doesn't seem reasonable. Zryn suggests using an equation to find the current through R1 instead of KVL, and also asks if there is a known answer the person is working towards. The person thanks Zryn for their help.
  • #1
PainterGuy
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Hi, :smile:

I'm sorry for the poor handwriting in the attached scan. I need to find I2 and Vab. I'm more than sure that my solutions are wrong. :redface: But don't know where I went wrong. I started with L1 on the left. I assumed the current in the L1 as I1=3A as supplied by the current supply. Then applied KVL where I assumed overall voltage to be 0V. While applying KVL on L1 the current through R1=3 ohm is I1-I2. Will someone please tell me what goes wrong there? Many thanks for your help.

http://img84.imageshack.us/img84/3064/i2andvab.jpg
 
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  • #2
I started with L1 on the left. I assumed the current in the L1 as I1=3A as supplied by the current supply. Then applied KVL where I assumed overall voltage to be 0V. While applying KVL on L1 the current through R1=3 ohm is I1-I2

When doing KVL around L1 on the left keep in mind that you're trying to find the current, but you already have it. Its just I1=3A! All you need to do is get an equation that ties the L1 current and the L2 current together, and that's the current through the R1 resistor I(R1) = I1 - I2.

If you really want to do KVL you have to include an unknown voltage for the current source, which is undesirable as it introduces another variable.

Also if I2 = 3A and I1 = 3A then I(R1) = 0 as there's no current going through the 3R resistance, which doesn't sound reasonable.

Do you have a known answer you are working towards?
 
  • #3
Zryn, many, many thanks for all this help. You are so nice. Sorry, I'm little late with my thanks. :)

Cheers
 

FAQ: Why my solutions are wrong for this circuit problem?

Why is my circuit not functioning properly?

There could be several reasons why your circuit is not functioning properly. It could be due to a faulty component, incorrect wiring, or incorrect calculations. You may need to double-check your circuit design and make sure all components are connected properly.

Why are my calculations not matching the expected results?

If your calculations are not matching the expected results, it could be due to a mistake in your calculations or using incorrect values for your circuit components. Make sure you are using the correct values and double-check your calculations to ensure accuracy.

Why are my measurements different from the theoretical values?

There could be several factors that can cause a difference between theoretical and measured values. These include measurement errors, component tolerances, and environmental factors. Make sure to use precise measurement tools and consider possible external factors that may affect your results.

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If your circuit is overheating or getting damaged, it could be due to excessive current or incorrect voltage levels. Make sure to use the correct voltage and current ratings for your components, and consider adding cooling mechanisms if needed.

Why is my circuit not meeting the desired specifications?

If your circuit is not meeting the desired specifications, it could be due to a design flaw or using incorrect components. Consider revising your circuit design or using components with better specifications to achieve the desired results.

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