When a pair of 1-ohm resistors are connected in series, their combined resistance is
A) 2 ohms, and when in parallel, 1 ohm.
B) 1 ohm, and when connected in parallel, 2 ohms.
C) 2 ohms, and when in parallel, 1/2 ohm.
D) 1/2 ohm, and when in parallel, 2 ohms.
E) none of these

Question

Quizplus · Accepted Answer

When resistors are connected in series, their resistances add up. Therefore, two 1-ohm resistors in series have a combined resistance of 2 ohms. When connected in parallel, the combined resistance is given by 1/(1/R1 + 1/R2) = 1/(1/1 + 1/1) = 1/2 ohm.

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