Question

please solve fastly​

Answer 1

Explanation:

Let R be the effective resistance

Since it is a parallel combination Voltage remains constant.

current I is not constant

therefore total current I =I1 +I2+I3.....(1)

I=V/R

therefore

V/R = V/R1 +V /R2 +V/R3. (substitute in (1) )

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

therefore R= R1 ×R2× R3 /R1R2 +R1R3 + R2R3