Question

A resistance of 12 ohm is connected in parallel with another resistor X. The resultant
resistance of the combination is 4.8 ohm. What is the resistance X?

Answer 1

Answer:

R(resultant) =12X/12+X

4.8×12+4.8X=12X

7.2X=57.6

X=8ohm

Answer 2

Answer:

X = 8 ohm

Explanation:

1/R(resultant) = 1/12 + 1/X

1/4.8 = 1/12 + 1/X

1/X = 5/24 - 1/12

1/X = 3/24

X = 8 ohm