Simple Error Could use some help

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The discussion revolves around a calculation error in determining the difference in current (delta-I) using resistances R1 and R2. The user calculated I and I' based on the sum of R1 and R2, leading to a discrepancy between their result (.013) and the teacher's marked answer (.004). It was clarified that R2 is irrelevant to the specific question, as the voltage across R1 is the primary factor. The conversation highlights the importance of understanding the context of the problem, even when additional components are included. Ultimately, the discussion serves as a learning moment about the nuances of circuit analysis.
xpack
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http://img401.imageshack.us/img401/3074/38927294.png I added r1 and r2 together to produce 8.571 and made
I=10/8.571
and
I'=10/8.671
and subtracted I from I' and got .013
But my teacher marked the answer as .004

How is this?
 
Last edited by a moderator:
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xpack said:
http://img401.imageshack.us/img401/3074/38927294.png


I added r1 and r2 together to produce 8.571 and made
I=10/8.571
and
I'=10/8.671
and subtracted I from I' and got .013
But my teacher marked the answer as .004

How is this?

I believe R2 is irrelevant to this question.

The delta-I comes about because in one case you have 10V across R1, and in the other case, you have 10V across <what?>...
 
Last edited by a moderator:
Oh okay thanks, that's what I thought but I didn't think the teacher would put an r2 if it wasn't relevant guess I was wrong.
 
xpack said:
Oh okay thanks, that's what I thought but I didn't think the teacher would put an r2 if it wasn't relevant guess I was wrong.

Yes, it's a little sneaky, but it helped to teach you something extra on this problem, so it's worthwhile. :smile:
 

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