Answer: Algebraic sum of all voltages = 0.
- A Total resistance = 0 in most textbook accounts
- B Algebraic sum of EMFs = 0 during normal conditions
- C Algebraic sum of all voltages = 0
- D Current is constant as generally observed
Correct answer: C. Algebraic sum of all voltages = 0
Explanation: KVL: sum of all potential drops and rises around any closed loop = 0 (energy conservation).
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.