If two resistors, A(R1) and B(R2) stand in parallel with each other in electrical wire, the total resistor appears as R1R2/(R1+R2). If three resistors, A(R1), B(R2), and C(2R2) stand in parallel in electrical wire, what is the ratio J of the resistors’ sum of A and C to the resistors’ sum of A and B?
Choose the correct choice from the following choices
A) 2(R1+R2):(R1+2R2) B) (R1+R2):(R1+2R2) C) (2R1+R2):(R1+2R2) D) 2(R1+R2):(2R1+R2) E) 2(R1-R2):(R1+2R2)
two resistors A (r1) and B (r2).   total or sum of two resistors appear as   r1r2/r1+r2. It is looks like inversion of sum of rates.   1/r1+1/r2= r1+r2/r1r2.   same way sum of A(r1) and c(2r2)=1/r1+1/2r2   =2r2+r1/r12r2.   inversion rate = r12r2/2r2+r1.   ratio J of sum of a and c/sum of a and b=2r2r1/2r2+r1*r1+r2/r1r2   =2(r1+r2)/2r2+r1.2(R1+R2):(R1+2R2)
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If two resistors, A(R1) and B(R2) stand in parallel with each other in electrical wire, the total resistor appears as R1R2/(R1+R2). If three resistors, A(R1), B(R2), and C(2R2) stand in parallel in electrical wire, what is the ratio J of the resistors’ sum of A and C to the resistors’ sum of A and B?