Answer: 10 V.
- A 10 V
- B 11 V
- C 12 V
- D 2 V
Correct answer: A. 10 V
Explanation: I = EMF/(R+r) = 12/12 = 1 A. Terminal voltage = EMF - Ir = 12 - 1 x 2 = 10 V.
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.