# Circuit Diagram Confusion

• Engineering
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

Homework Helper
Gold Member
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?

Staff Emeritus
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.

Homework Helper
Gold Member
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.