Which of the following statements about electric current at a single junction in a…
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits
Problem
Which of the following statements about electric current at a single junction in a steady-state circuit is correct?
(a) The sum of currents entering a junction is greater than the sum leaving because energy is dissipated as heat at the junction.
(b) In steady state, the current through each branch that leaves a junction is determined solely by that branch’s resistance and is independent of the resistances of the other branches.
(c) The total current entering a junction equals the total current leaving the junction.
(d) The algebraic sum of currents at a junction is zero only if the junction’s potential remains constant; otherwise excess charge accumulates and upsets the balance.