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C) 1.0 A
find total resistance
reduce from right
series 2+4+2=8
parallel (8*8) /(8+8) =4
series 2+4+2=8
parallel (8*8) /(8+8) =4
series 3+4+2=7
total resistance=7 ohms
V=IR
I=V/R (V=9 & R=9)
finally I=9/9
I=1.0 A
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