As in the case of nodal analysis of circuits with voltage sources, mesh analysis is easier if there are current sources present. To illustrate this point, let us consider the circuit of Fig. 4.14(a), which has two current sources and a voltage source. With the mesh currents i1,i2and i3 chosen as shown, it is clear that we need three independent equations. Not all of these, however, have to be mesh equations. The presence of the two current sources provides us with two constraints which we may obtain by inspection