Question

why we find total resistance in parallel in reciprocal​

Answer 1

Answer:

Explanation: because it is

inversely proportional.

Answer 2

Answer:

Your question is very valid the reason is that when we find equivalent resistance in parallel connection the terminals of the resistances are at the same potential, I mean different resistances start at one point and end at another point but they are together. Hence the potential difference must also be same across each resistor, since the potential difference just depends on the final and initial point.

Explanation:

Derivation

let R be the equivalent potential

since the potential difference is same across each resistor then the potential drop across the equivalent resistance is also same, say V

so

V/R= V/R1+VR2+V/R3+....

1/R= 1/R1+1/R2+1/R3+...