Answer: Sum of currents in = Sum of currents out.
- A The sum of all voltage drops around the junction equals zero
- B Sum of currents in = Sum of currents out
- C All currents at the junction cancel to exactly zero individually
- D The equivalent resistance at the junction is minimized
Correct answer: B. Sum of currents in = Sum of currents out
Explanation: KCL: algebraic sum of currents at any junction = 0 (charge conservation). Currents in = currents out.
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.