Find the equivalent resistance in series and parallel combination

1.	Find the equivalent resistance in series and parallel combination
Answer» for parallel combinationlet resistance R1,R2total current=I1+I2for frist resistancev=rii=v/rI1=v/R1 .......1for second resistanceI2=v/R2..........2FROM EQUATION 1 AND SECONDI1+I2=V/R1+V/R2I=V(1/R1+1/R2) for SERIES combinationlet resistance R1,R2total POTENTIAL DIFFERENCE=V1+V2for frist resistancev=riV1=R1I .......1for second resistanceV2=R2I..........2FROM EQUATION 1 AND SECONDV1+V2=R1I+R2IV=I(R1+R2)HENCE V=IRIR=I(R1+R2)R=I(R1+R2)/IR=R1+R2

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