Posted by susane on Wednesday, March 28, 2007 at 7:03am.
A total resistance of 3 ohms is to be producd by combining an unknown resistor R with a 12 ohm resistor. What is the value of R and how is it connected to the 12 ohm resistor
a) 4.0 ohm parallel
b) 4.0 ohm in series
c) 2.4 ohm in parallel
d) 2.4 in series
e) 9.0 in parallel
My work: A, 1/12 + 1/4= 1/3 or 3 ohm resistance
By using only two resistors, R1 and R2, a student is able to obtain resistance of 3 ohm, 4 ohm, 12 ohm, and 16 ohm using the alone combination. The values of R1 and R2 (in ohms) are:
A) 3,4
b) 2,12
c) 3, 16
d) 4, 12
e) 4, 16
My answer is d 4,12. Since 4 is alone, 12 is alone. in series 12+4=16 and in parallel the value is 3.
thank you
correct.

physics (please check)  Henry, Monday, June 15, 2015 at 6:10pm
12*R/(12+R) = 3
3R + 36 = 12R.
9R = 36.
R = 4 Ohms in parallel.
4, and 12 Ohms.

physics (please check)  MJAAFAR, Friday, June 24, 2016 at 2:44pm
THE ANSWER IS B, 4OHMS PARALLEL
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