Please complete the bottom question and explain in DETAIL, thank you. Find VS, a

Question

Please complete the bottom question and explain in DETAIL, thank you.

Explanation / Answer

R2*R3/(R2+R3)=2 kO+2 kO=4 kO=Req==>I2=18 V/6 kO=3 mA combine R2 and R3 into a single resistor R2*R3/(R2+R3) = 6k*3k/(6k + 3k) = 2 kohms you know that the voltage across this combination is 18V from the fact that v3 is 18V knowing that, we can find I1, and consequently Is 18V/2kohms = .009 A = I1 since I1 is in the opposite direction as Is, Is = -.009A to find the voltage, we can combine the 2kohm resistor(from the parallel combination) with R1 IR = V .009A * 4kohm = 36V

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