In general, in networks containing only conductances and current sources, KCL applied at the kth node, with node voltage vk may be written as follows. In the left member the coefficient of vk is the sum of the conductances connected to node k, and the coefficients of the other node voltages are the negatives of the conductances between those nodes and node k. The right member of the equation consists of the net current flowing into node k due to current sources.