Hello again, almost a here after...
The past year I asked for help to complete a few home tasks we were asked to perform for the Electronic class we have in my graduation.
This year I'm repeating this class and I'll need help again to improve a little bit my graduation score for this class!
The first task is just to calculate a few currents and voltage drops of a few simple circuits using several techniques as Thevenin theorem, Kirchoff Laws or Nodal Analysis.
Well, the 1st question I have is why, in the attached circuit, are I(R1), I(R2) and I(R3) of opposite signals from my calcs??? My calcs are:
\(
\left\{\begin{matrix}
i_{1}=i_{2}+i_{3}\\
i_{1}\cdot R_{1}+i_{3}\cdot R_{3}-10=0\\
i_{2}\cdot R_{2}+5-i_{3}\cdot R_{3}=0
\end{matrix}\right.\Leftrightarrow i_{1} = 7.31mA,\, i_{2} = -4.89mA,\, i_{3} = 12.21mA
[\tex]\)
The past year I asked for help to complete a few home tasks we were asked to perform for the Electronic class we have in my graduation.
This year I'm repeating this class and I'll need help again to improve a little bit my graduation score for this class!
The first task is just to calculate a few currents and voltage drops of a few simple circuits using several techniques as Thevenin theorem, Kirchoff Laws or Nodal Analysis.
Well, the 1st question I have is why, in the attached circuit, are I(R1), I(R2) and I(R3) of opposite signals from my calcs??? My calcs are:
\(
\left\{\begin{matrix}
i_{1}=i_{2}+i_{3}\\
i_{1}\cdot R_{1}+i_{3}\cdot R_{3}-10=0\\
i_{2}\cdot R_{2}+5-i_{3}\cdot R_{3}=0
\end{matrix}\right.\Leftrightarrow i_{1} = 7.31mA,\, i_{2} = -4.89mA,\, i_{3} = 12.21mA
[\tex]\)
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