Answer:
Step-by-step explanation:
a.
b.Rtđ= R1.R2/R1+R2= 6 ôm
U=U1 = I1.R1= 0,5.15= 7,5 V
c.
1/Rtđ'= 1/R1+1/R2+1/R3= 7/30
=> Rtđ' = 4,29 ôm
I= U/Rtđ' = 7,5/4,29= 1,75 A
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