In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
A) the potential of the nearest battery is the potential at the junction.
B) there are no transformations of energy from one type to another in a circuit loop.
C) capacitors tend to maintain current through them at a constant value.
D) current is used up after it leaves a junction.
E) charge is neither created nor destroyed at a junction.

Question

Quizplus · Accepted Answer

According to the law of conservation of charge, charge can neither be created nor destroyed in a circuit. Therefore, the sum of the currents entering a junction must be equal to the sum of the currents leaving the junction, as the amount of charge entering the junction must equal the amount of charge leaving it.

In a Loop in a Closed Circuit, the Sum of the Currents