1. The problem statement, all variables and given/known data There is a segment of a circuit with voltage sources and resistors. I need to find the difference in voltage between the ends. A picture of the circuit is attached. If a current I=3 A exists between points a and b, R1=2 [PLAIN]http://lon-capa.mines.edu/adm/jsMath/fonts/cmr10/alpha/100/char0A.png, [Broken] R2=8 [PLAIN]http://lon-capa.mines.edu/adm/jsMath/fonts/cmr10/alpha/100/char0A.png, [Broken] V1=4 V, and V2=15 V,the voltage difference Vb -Va is? 2. Relevant equations V=IR 3. The attempt at a solution My intuition told me that the voltage sources would not affect the voltage difference if there was a constant current. So I combined the resistors and applied Ohm's law. V=(3)(8+2). However this is not correct . Can someone help me with understand how the voltage sources in the circuit affect the circuit.