Calculating KVL Loop

Discussion in 'The Projects Forum' started by dukebdx12, Feb 1, 2008.

1. dukebdx12 Thread Starter Active Member

Jan 29, 2008
30
0
I have constucted a circuit with 5 resistors. I tried to find KVL left loop( has to be =0, in our project just very close). When I calculated it i got a negative number. I'm assumming I have messed up. I think where I did was when i soldered a node of 3 resistors I soldered them together instead of seperately. I looked at a pic of the final result and thought that it looked like the 3 wires were overlapped and soldered. Now that I look at it again it looks as each resistor wire were soldered seperately and just clipped. Do I need to re-do this?

2. hgmjr Moderator

Jan 28, 2005
9,030
214
Please post a diagram of the circuit so that we can better tell what your circuit looks like?

hgmjr

3. dukebdx12 Thread Starter Active Member

Jan 29, 2008
30
0
ok. give me 1 sec and I'll upload the diagram I have drawn on OrCad and I'll explain what I have done.

4. dukebdx12 Thread Starter Active Member

Jan 29, 2008
30
0
http://i186.photobucket.com/albums/x207/dukebdx12/hw3.jpg

here is a diagram. This is what I have done. I soldered the node R1,R2,R3 together on the circuit board(on accident) by overlapping the wires and soldering. Can that affect my calculations? If this is not the problem then I must have messed up somewhere with calculations. Of finding KVL left loop I have taken my VLeftBattery voltage - R1 - R3 + R4 and I got a negative number.

5. dukebdx12 Thread Starter Active Member

Jan 29, 2008
30
0
nevermind. I just re-calculated the board with my multimeter and for V1 i had got 8.54 and i just re-did it and have got 8.38 twice so now for the left loop I have got .03 which is very close to 0

6. Eyas Member

Dec 23, 2007
10
0
Your proble is that you assume the direction of I3 from down to up since the voltage is + up and - down.
OR, you can leave the direction of the current I3 as it is and this will make the voltage V3 as + down and - up