Problem + Hard 12-1    Source:    Problem 49 of the list of Electric Circuits I, from the School of Engineering at UFRGS, 2011, Prof. doctor Valner Brusamarello.

In the circuit of the Figure 12-01.1, the voltmeter V is known to indicate 12 volts. Calculate:

a) The voltage e.

b) The independent font value E.

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Problem + Hard 12-2    Source:   Problem 4.28 - page 170 -    IRWIN, J. Davis - Book: Analysis of Circuits in Engineering - 4th Edition - Ed. Pearson - 2013.

Calculate the value of V_x and the voltage V_o in the circuit of the Figure 12-02.1.

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Problem + Hard 12-3    Source:    Problem 70 of the list of Electric Circuits I, from the School of Engineering at UFRGS, Prof. doctor Valner Brusamarello.

In the circuit of the Figure 12-03.1 , it is known that if switch S is in position 1, the ammeter A shows a current of 5 A. If switch S is in position 2 then the ammeter A shows a current of 14 A.

Find the values ​​of I and K.

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