Load Voltage Problem - Find the Fault!

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alexmath
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Homework Statement



Problem is in the pic. uploaded.


Homework Equations





The Attempt at a Solution



Also in the pic. The right answer is -3, where is the fault? Thank you!
 

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It is hard to read your approach.
You just consider I2 to calculate the final voltage, but there is also I1 flowing through the resistor. And you should use units in a consistent way.
 
You are right. My mistake!
 
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