Determine the current at start-up and the battery discharged

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The discussion focuses on calculating the current at start-up (I1) and the discharged battery current (I2) using Kirchhoff's laws. The equations derived are R1*I1 + R2*I2 + E2 + E1 = 0 and R3*I1 = E2 + R2*I2. The calculated values indicate that I1 equals -171.42 A and I2 equals -0.2858 A, suggesting a significant discharge condition. The justification for assuming the same current through R3 and R1 is questioned, emphasizing the need for clarity in circuit analysis.

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A discharged battery is charged through connection with a charged battery of another car with direct cable connection. Determine the current at start-up and the battery discharged
 

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It is corret:

R1*I1 + R2 * I2 + E2 + E1 = 0
0,01I1 + I2 -10 +12 = 0
I2 = -0,01I1 -2


R3*I1 = E2 + R2*I2
0,06I1 = -10 + I2
I2 = 0,06I1 + 10


0,06I1 + 10 = -0,01I1 - 2
0,07I1 = -12
I1 = -171,42 A

I2 = -0,2858A


I1 => current at start-up
I2 => current battery discharged

Correct ?
 


What's your justification for assuming that the current through R3 is the same as that through R1?
 

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