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Series Parallel numerical

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Electrical Tutorial 1)   Calculate the equivalent resistance (Req)?          Ans :  first R10 and R8 are in series             So,  R10 =2 ohm                     R8  = 10 ohm               R10+ R8 =(10 + 2 ) ohm = 12 ohm Now,  12 ohm and R9 are in parallel              R9=6 ohm So, Rparallel= (12*6) /(12+6) =4 ohm Now,  R7 and 4 ohm are in series                R7=8 ohm    Rseries =(4+8) ohm =12 ohm R6 and 12 ohm are in parallel                 R6=6 ohm Rparallel = (6*12)/(6+12) =4 ohm R5 and 4 ohm are in series            R5= 4 ohm  Rseries=(4+4) =8 ohm R4 and 8 ohm are in parallel            R4=8 ohm Rparallel ...