Answer: 6 ohm.
- A 1.33 ohm
- B 2 ohm
- C 4 ohm
- D 6 ohm
Correct answer: D. 6 ohm
Explanation: Resistors in series: R = R<sub>1</sub> + R<sub>2</sub> = 2 + 4 = 6 ohm.
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.