We have 12 equal resistors with a value equal to R placed on the edges of a cube, as shown in the figure. Calculate the equivalent resistance between points A and G that form one of the main diagonals of the cube.

Six resistors, each with resistance R, are arranged to form a tetrahedron, as shown. Determine the equivalent resistance between points A and B.

Find the equivalent resistance between points A and B of the circuit shown in the figure.

Between the terminals, A and B of the figure, it is applied a voltage of 200 V. Calculate the magnitudes of the currents in each resistor and the equivalent resistance.