Engineering What are the Unknowns in a KVL Circuit Loop?

AI Thread Summary
In a KVL circuit loop discussion, participants explore the implications of applying Kirchhoff's Voltage Law (KVL) to a circuit with multiple resistors and voltage sources. The voltage across resistor R3 is influenced by the voltage source Vs2, leading to questions about the relationship between the voltages across R1 and R2. The current through R1 and R2 is the same, which simplifies the analysis, as the voltages can be expressed as Vr1 = I1 * R1 and Vr2 = I1 * R2. Participants emphasize the need to write a KVL equation for the left-hand loop to clarify the unknowns. Overall, the discussion focuses on understanding how to apply KVL effectively in the presence of multiple components.
eatlsep
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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
 
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What does Vs2 do to the voltage across R3?

Then apply KVL around the left hand loop.
 
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?
 
eatlsep said:
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.
 
eatlsep said:
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.
 

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