step 1 :
1/Rp = 1/4 + 1/4 = 2/4
Rp = 4/2 = 2 Ω
__ __ __
step 2 :
Rtot = R + Rp
Rtot = [R + 2] Ω
step 3 :
V = i•Rtot
Rtot = V/i
Rtot = 10/2 = 5 A
[R + 2] = 5
R = 3 Ω ✔
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step 1 :
1/Rp = 1/4 + 1/4 = 2/4
Rp = 4/2 = 2 Ω
__ __ __
step 2 :
Rtot = R + Rp
Rtot = [R + 2] Ω
__ __ __
step 3 :
V = i•Rtot
Rtot = V/i
Rtot = 10/2 = 5 A
[R + 2] = 5
R = 3 Ω ✔