- #1
shigg927
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[SOLVED] Kirchoff's Laws
"The circuit in the figure is composed of two batteries (ε1 = 8 V and ε2 = 4 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 50 Ω, and R4 = 50 Ω) as shown. What is the current I1 which flows through R1? What is the current that flows through R3?"
So, I wasn't sure if the junction rule applies here, and if there is supposed to I2 that I draw in? So, my first attempt included I3=I1+I2, but it became really complicated to solve and it was still not the right answer.
My second attempt included the equations 8 + 50I3 + 4 - 40I3 + 110 I1=0 for the first loop and -4 + 50 I3 -40I1=0 for the second loop. Obviously this was wrong as when I submitted, I got a big fat no. I'm so lost as to what I'm doing wrong or how to set this up, help!
Homework Statement
"The circuit in the figure is composed of two batteries (ε1 = 8 V and ε2 = 4 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 50 Ω, and R4 = 50 Ω) as shown. What is the current I1 which flows through R1? What is the current that flows through R3?"
Homework Equations
So, I wasn't sure if the junction rule applies here, and if there is supposed to I2 that I draw in? So, my first attempt included I3=I1+I2, but it became really complicated to solve and it was still not the right answer.
The Attempt at a Solution
My second attempt included the equations 8 + 50I3 + 4 - 40I3 + 110 I1=0 for the first loop and -4 + 50 I3 -40I1=0 for the second loop. Obviously this was wrong as when I submitted, I got a big fat no. I'm so lost as to what I'm doing wrong or how to set this up, help!