What are the Unknowns in a KVL Circuit Loop?

[eatlsep]

1.http://imgur.com/d2lf8sa



2. V=IR



3. I feel like the answer should just be .012 because 1.2/100. Apparently that is wrong. If that is truly wrong. I also found I3 to be 3.25mA because 3.9 volts in parallel and V=IR

 

[CWatters]

What does Vs2 do to the voltage across R3?

Then apply KVL around the left hand loop.

 

[eatlsep]

Vs2 makes the voltage across R3 equal to Vs2? Then if I apply KVL to the left side I have 2 unknowns Vr1 and Vr2. Should I have another KVl loop?

 

[NascentOxygen]

Vs2 makes the voltage across R3 equal to Vs2? Then if I apply KVL to the left side I have 2 unknowns Vr1 and Vr2.

Write the equation for the sum of the voltages around the left-side loop.

The same current goes through R1 as R2.

 

[CWatters]

Vs2 makes the voltage across R3 equal to Vs2? Then if I apply KVL to the left side I have 2 unknowns Vr1 and Vr2.

Vr1 and Vr2 aren't really "unknown"...

Vr1 = I1 * R1
Vr2 = I1 * R2

As we said, write the KVL equation for the left hand loop.

As I hinted earlier Vr3 = Vs2 (which is known).

Come back if still stuck.