I think if R=1/R1+1/R2+1/R3, the 1/R=1/(1/R1+1/R2+1/R3).
I’m not sure how to start this problem (See attachment). I have to differentiate R with respect to R1 but the equation given is in the form 1/R, not R. How should I rearrange this function to make R the subject of this equation.
Any help showing working would be a great help.
Thanks, Daddy_Long_Legs