We have the two figures below, in which the currents are either numbered, either marked down with alphabetical indexes; determine the currents 
in relation to 
.
By applying Kirchhoff's 1st Law, determine the value of the current 
.
Considering the indicated values and reference directions, check up if the voltages represented in the figure below, verify Kirchhoff's 2nd Law.
By applying Kirchhoff's 2
nd Law, determine the value of the voltage 
.
