Problem + Hard 15-1    Source:    Problem 65 - List of Problems Electrical Circuits I of the School of Engineering - UFRGS - 2011 - Prof. doctor Valner Brusamarello.

In the circuit of the Figure 15-01.1, when the switch "S" is in position 1 the ammeter reads +2A. Determine the current flowing through the 4 ohm resistor when the switch moves to position 2.

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Attention: In the UFRGS list there is a typo in the problem statement. The value measured by the ammeter, when the switch is in position 1, it is + 2A and not - 2A.

Problem + Hard 15-2    Source:    Problem 38 - List of Problems Electrical Circuits I of the School of Engineering - UFRGS - 2011 - Prof. doctor Valner Brusamarello.

In the circuit of Figure 15-02.1, when the switch "S" is in position 1, E₁ = - 5 V and E₂ = 5 V. In this condition the voltmeter indicates 0 volts. Determine the value of the constant K, as well as the value indicated by the voltmeter when the switch S is in position 2 and E₁ = E₂ = 5 V.

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Problem + Hard 15-3    Source:    Problem 2 of P1 - 1st semester - 2016 - Discipline: Electrical Circuit Engineering Analysis - ULBRA - Prof. doctor João Carlos Vernetti dos Santos.

In the circuit of the Figure 15-03.1, when the switch S is in position 1, the current I = 1.2 A. Determine the value of the voltage V_ab, when the key S is in position 2.

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