Question: (a) Write down the incidence matrix A for the illustrated electrical network. (b) Suppose all the wires contain unit resistors, except for R4 = 2.

(a) Write down the incidence matrix A for the illustrated electrical network.

(b) Suppose all the wires contain unit resistors, except for R4 = 2. Let there be a unit current source at node 1, and assume node 5 is grounded. Find the voltage potentials at the nodes and the currents through the wires.
(c) Which wire would shock you the most?

3 6 2 5 3 5 2

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