Question

2. Derived expression for parallel combination of two resistances.​

Answer 1

Explanation:

In a parallal combination voltage is same across each resitors.

using ohm's law

V=IR

V1 = i1 x R1

V2 = i2 x R2

I = i1 + i2

V/R = V/R1 + V/R2

since V is same

1/R = 1/R1 + 1/R2