Question

Two resistors R1 ohms and 12ohms are connected in parallel in a circuit if the resultant resistance in the circuit is 3ohms find the value of R

Answer 1

Hey.. I think this can be ur answer!!

Two resistors connected in parallel so,
1 /R 1 +1/12 =3
1 /R1 = 3-1/12
1 /R 1 = 36-1/12
1/R 1=35/12
R1 =12/35 = 0.34 ohm

Answer 2

The resistors are connected in parallel.

so,

$\frac{1}{rp} = \frac{1}{r1} + \frac{1}{r2}$


$\frac{1}{3} = \frac{1}{r1} + \frac{1}{12}$


$\frac{1}{r1} = \frac{1}{3} - \frac{1}{12}$


$\frac{1}{r1} = \frac{12 - 3}{36}$

$\frac{1}{r1} = \frac{9}{36}$


$\frac{1}{r1} = \frac{1}{4}$

$r1 = 4 \: ohms.$


hope this helps ! ! !