Question

A circuit contains two devices that are connected in parallel. If the resistance of one of these devices is 12 ohms and the resistance of the other device is 4 ohms, the total resistance of the two devices is

A. 0.333 ohms.
B. 16 ohms.
C. 3 ohms.
D. 0.0625 ohms

Answer 1

the answer is c. 3 ohms.

Answer 2

Answer: The correct option is 3 ohms.

Solution:

When resistors are connected in parallel the total resistance is given by :

`(1)/(R_(total))=\sum_(i=1)^n(1)/(R_1)+(1)/(R_2)+...(1)/(R_n)`

`R_1=12 ohm`

`R_2=4 ohm`

`(1)/(R_(total))=(1)/(12)+(1)/(4)=3 ohm`

The total resistance of the two devices is 3 ohm .