Determine the current at start-up and the battery discharged

[Apprentice123]

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

 

[Apprentice123]

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 ?

 

[ideasrule]

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