AP Physics C: Electricity and Magnetism Flashcards: Kirchhoff's Loop Rule
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
How can you visually represent the electric potential at various points within a circuit loop?
The values of electric potential can be represented by a graph of electric potential as a function of position within the loop.
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How can you visually represent the electric potential at various points within a circuit loop?
The values of electric potential can be represented by a graph of electric potential as a function of position within the loop.
State Kirchhoff's loop rule.
Kirchhoff's loop rule states that the sum of potential differences across all circuit elements in a single closed loop must equal zero.
Why must the sum of potential differences in a closed loop equal zero?
It must equal zero due to the conservation of energy; a charge returning to its starting point must have the same potential energy, resulting in a net potential difference of zero.
What fundamental conservation law is Kirchhoff's loop rule a consequence of?
Kirchhoff's loop rule is a consequence of the conservation of energy.
For what purpose is Kirchhoff's loop rule applied to a circuit?
Kirchhoff's loop rule is applied to describe a circuit or the elements within it by summing the potential differences around a closed path.
What is the mathematical equation for Kirchhoff's loop rule?
The relevant equation is $\sum\Delta V=0$, which signifies that the sum of potential differences in a closed loop is zero.
In the context of circuits, what does $\sum\Delta V=0$ mean?
This equation means that if you add up all the voltage increases (from batteries) and voltage drops (across resistors) in any closed loop, the total will be zero.
How does the loop rule connect the concepts of electric potential and energy conservation?
The rule states the net change in potential (energy per charge) around a loop is zero, which is a direct statement of energy conservation for a charge completing that loop.
On a graph of electric potential vs. position for a circuit loop, what is the relationship between the starting and ending potential values?
The potential value at the end of the loop must be equal to the potential value at the start, visually demonstrating that the total change in potential is zero.
What physical quantity is conserved according to the loop rule?
Energy is the physical quantity that is conserved.