I am having issues with Norton and Thevenin. I think I have the basic concepts, but I am still really unsure about how these are done.
I have read the other posts and because my circuit is different, I am not sure how to apply the info in those posts to my circuits.
Please review my work and see if I am on the right track.
****The attached Thumbnail is the circuit****
1.) Thevenin Voltage if R3 is the load
 I removed R3 and calculated voltage across it
V(th) = 10v/(R1//R2) + R4
V(th) = 10/ (1/(1/2+1/4))+2
V(th) = 9.5V
2.) Norton Current if R2 is the load
V(th) = 10V/8ohms * 6ohms = 7.5 V
R(th) = R1//(R4+R3)
R(th) = 1/2 + 1/6
R(th) = 1.5 ohms
I(norton) = V(th) / R(th)
I(n) = 7.5V/1.5ohms
I(n) = 5A
3.) Thevenin resistance if R4 is the load
V(resistor 2) = R2/(R1+R2) * Voltage
V(r2) = 4/6 * 10
V(r2) = 6.67 = V(th)
R(th) = R3 + (R1//R2) + R4
R(th) = 7.3 ohms
**P.S.**
Am I suppose to do anything with the Current source? I just left it out because one step of simplifying the circuit is to short voltage sources and open current sources
I have read the other posts and because my circuit is different, I am not sure how to apply the info in those posts to my circuits.
Please review my work and see if I am on the right track.
****The attached Thumbnail is the circuit****
1.) Thevenin Voltage if R3 is the load
 I removed R3 and calculated voltage across it
V(th) = 10v/(R1//R2) + R4
V(th) = 10/ (1/(1/2+1/4))+2
V(th) = 9.5V
2.) Norton Current if R2 is the load
V(th) = 10V/8ohms * 6ohms = 7.5 V
R(th) = R1//(R4+R3)
R(th) = 1/2 + 1/6
R(th) = 1.5 ohms
I(norton) = V(th) / R(th)
I(n) = 7.5V/1.5ohms
I(n) = 5A
3.) Thevenin resistance if R4 is the load
V(resistor 2) = R2/(R1+R2) * Voltage
V(r2) = 4/6 * 10
V(r2) = 6.67 = V(th)
R(th) = R3 + (R1//R2) + R4
R(th) = 7.3 ohms
**P.S.**
Am I suppose to do anything with the Current source? I just left it out because one step of simplifying the circuit is to short voltage sources and open current sources
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