Answer: 12.
- A 8
- B 12
- C 15
- D 18
Correct answer: B. 12
Explanation: Possible combinations: each alone (3), pairs in series/parallel (3 pairs x 2 = 6), all three (series, parallel, mixed) = 3+6+multiple. Enumerating: singles=3, all series=1, all parallel=1, pairs=6, 2+1 hybrid... total distinct values can be 12.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.