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a. 1/R total = 1/4 + 1/6 + 1/12
= 3/12 + 2/12 + 1/12 = 6/12
R total = 12/6 = 2 ohm
b. V = I × R
I = V/R
= 3/2= 1,5 A
3.
R total = 1 + 4 = 5 ohm
I = 200 mA = 200/1000 = 0,2 A
V = I × R
= 0,2 × 5 = 1 volt