A circuit contains two batteries (with negligible internal resistance) and five ohmic resistors (Figure 20.83). The connecting
wires have negligible resistance. The letters A through H are shown to make it possible to refer to specific parts of the
circuit.
(a) Write all the equations necessary to solve for the unknown currents I1, I2, I3, I4, and I5, whose directions are
indicated on the circuit diagram. Do not solve the equations, but do explain very clearly what your equations are
based on, and to what they refer.
Assume that a computer program has solved your equations in terms of the known battery voltages and known
resistances, so that the currents I1, I2, I3, I4, and I5 are known.
(b) In terms of the known quantities, calculate VD − VA, and check that your sign makes sense.
(c) In terms of the known quantities, calculate the power produced in battery number 2.