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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?
Calculating KVL Loop
- Thread starter dukebdx12
- Start date
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.
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.
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
One Advice:
if you assume the direction of a current, label the polarity of the voltage such that the current enter the + and leave the - terminal.
OR:
if you assume the polarity of the voltage, label the current such that the current enter the + and leave the - terminal.
In both cases if you get a negative reading of current or voltage, then the real direction of current or voltage is the reverse.
GOOD LUCK
OR, you can leave the direction of the current I3 as it is and this will make the voltage V3 as + down and - up
One Advice:
if you assume the direction of a current, label the polarity of the voltage such that the current enter the + and leave the - terminal.
OR:
if you assume the polarity of the voltage, label the current such that the current enter the + and leave the - terminal.
In both cases if you get a negative reading of current or voltage, then the real direction of current or voltage is the reverse.
GOOD LUCK
