AP Physics 2 / Unit 11: Electric Circuits
11.7 Kirchhoff's Junction Rule
Notes
Current into a junction equals current out (charge conservation).
Practice
5 A enters a junction; 2 A leaves on one branch. The other branch carries:
$5-2$.
The junction rule is based on conservation of:
Charge doesn't pile up.
Three branches leave a junction with 1 A, 2 A and 3 A. Current in:
Sum.
Ready for more? Take the Unit 11 test.