When a pair of 1-ohm resistors are connected in series, their equivalent (combined)resistance is 2 ohms, and when connected in parallel is
A)½ ohm.
B)none of the above
C)also 2 ohms.

Question

Quizplus · Accepted Answer

When resistors are connected in series, their equivalent resistance is obtained by adding individual resistances R1 and R2.
Therefore, when two 1-ohm resistors are connected in series, their equivalent resistance is 1+1=2 ohms.
When resistors are connected in parallel, their equivalent resistance is obtained by dividing the product of individual resistances R1 and R2 by the sum of individual resistances.
Therefore, when two 1-ohm resistors are connected in parallel, their equivalent resistance is (1*1)/(1+1)=0.5 ohms, which is the best choice.

When a Pair of 1-Ohm Resistors Are Connected in Series