Four 12 $\Omega$ resistors are connected together.Which of the following resistances cannot be formed using all 4 resistors?
A) 48 $\Omega$
B) 9.0 $\Omega$
C) 12 $\Omega$
D) 60 $\Omega$
E) 20 $\Omega$

Question

Quizplus · Accepted Answer

Using four 12 $\varOmega$ resistors, you can form 48 $\varOmega$ (series), 9 $\varOmega$ (3 in parallel, 1 in series), 12 $\varOmega$ (all in parallel), and 20 $\varOmega$ (2 in series, 2 in parallel). However, 60 $\varOmega$ cannot be formed with these combinations.

Four 12 Ω\OmegaΩ Resistors Are Connected Together Ω\OmegaΩ B) 90 Ω\OmegaΩ C) 12 Ω\OmegaΩ

Four 12 $\Omega$ Resistors Are Connected Together $\Omega$ B) 90 $\Omega$ C) 12 $\Omega$