Four wires meet at a junction. it is assumed that two currents, i1 and i4, enter the node. an ammeter records a value of +4a for i1. currents i2 and i3 are travelling out of the node. i2 has 3a running through it, and i3 has 0.5 a running through it. what is the current in i4?

Kirchhoff’s Current Law states that sum of entering currents is equal to sum of exiting currents.


We are given information:


Kirchhoff’s Current Law for our example is:





We got negative value for current. This means that current I₄ is not entering but it is leaving from the junction.