Method 2 in Figure 3-11 can be used whether or not there is a resistance in series with the voltage source. When node B is selected as the reference node, then by definition vB = 0 and the fundamental property of node volt ages says that vA = vB. We do not need a node-voltage equation at node A because its voltage is known to be equal to the source voltage. We write The node equations at the remaining N-2 non-reference nodes in the usual way. In the final step, we move all terms involving vA the right side, to since it is a known input and not an unknown response. Method 2 reduces the number of node equations by 1 since no equation is needed at node A