Physics Midterm Explanation Kirkoff Rule

  • Thread starter Nimmy
  • Start date
  • #1
41
0
Its the part c question....which states

C) Suppose we made V = 0. Find the new current running through the 5.00 ohm resistor.


So I just took the biggest loop and did it this way

Sum of V = 0

So starting at the upper left hand corner of the circuit

-3A(15 Ohms) + 50 V + I (5) = 0

-45 + 50 +5I = 0

5 +5I = 0
I = -1 A

Which is not correct. The answer I think is supposed to be 2.5 Amps but can you tell me what mistake I'm making here.
 

Attachments

Answers and Replies

  • #2
Doc Al
Mentor
45,029
1,326
I assume the currents labeled in the diagram are from an earlier part of the problem. You can't just assume that the currents remain the same.
 

Related Threads on Physics Midterm Explanation Kirkoff Rule

  • Last Post
Replies
12
Views
2K
Replies
7
Views
1K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
13
Views
2K
  • Last Post
Replies
1
Views
2K
Replies
2
Views
3K
  • Last Post
Replies
15
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
5
Views
552
Top