Question

If currents \[I_1\] and \[I_2\] enter a junction and currents \[I_3\] and \[I_4\] leave it, which equation follows from Kirchhoff's First Law?

Options

• \[I_1+I_2=I_3+I_4\]

• \[I_1+I_2+I_3+I_4=1\]

• \[I_1-I_2=I_3+I_4\]

• \[I_1+I_3=I_2+I_4\]

Answer 1

The currents entering are \[I_1\] and \[I_2\], while the currents leaving are \[I_3\] and \[I_4\]. KCL equates the total entering current to the total leaving current.