- #1
Tsandman
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Hi, The picture below is part of the notes given to us by our teacher. In case it doesn't work, it's a double loop with a voltage source on the left arm, a resistor (R1) on the middle arm, and two resistors in series (R2 and R3) on the right arm. all the resistors and the voltage source are positive at the node at the top of the page.
The current is I1 in the left arm, I2 in the middle arm, and I3 in the right arm.
For summing the voltages around the right hand loop with a clockwise summing loop, is it:
I2*R1 + I3*R2 + I3*R3 = 0
or
- I2*R1 + I3*R2 + I3*R3 = 0
The teacher said it's the second one, but i thought that seeing as the summing loop enters R1 from the negative end the sign is different?
Thanks in advance for any help.
http://screencast.com/t/QTDiBUruA
The current is I1 in the left arm, I2 in the middle arm, and I3 in the right arm.
For summing the voltages around the right hand loop with a clockwise summing loop, is it:
I2*R1 + I3*R2 + I3*R3 = 0
or
- I2*R1 + I3*R2 + I3*R3 = 0
The teacher said it's the second one, but i thought that seeing as the summing loop enters R1 from the negative end the sign is different?
Thanks in advance for any help.
http://screencast.com/t/QTDiBUruA