Problem + Hard 11-1    Source:    Problem 23 and 48 - List of Electric Circuit exercises I - School of Engineering - UFRGS - 2011 - Prof. doctor Valner Brusamarello.

In the circuit of the Figure 11-01.1, when E = 90, I = 15 , the resistor R dissipates maximum power. The voltmeter reads 45 volts and the ammeter reads - 15 A. Determine the reading of the voltmeter and the ammeter when E = 20 volts, I = 10 amps and R_x falling to 1/3 of its previously calculated value.

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Problem + Hard 11-2    Source:    Problem 51 - List of Electric Circuit exercises I - School of Engineering - UFRGS - 2011 - Prof. doctor Valner Brusamarello.

In the circuit of the Figure 11-02.1, when the switch "S" is in "position 1" the voltmeter indicates - 15 Volts.

a) Determine the value of "E".

b) Determine the ammeter reading when the switch "S" is in "position 2".

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Problem + Hard 11-3    Source:    Problem 41 - List of Electric Circuit exercises I - School of Engineering - UFRGS - 2011 - Prof. doctor Valner Brusamarello.

In the circuit of the Figure 11-03.1, when the switch "S" is in "position 1" the voltmeter indicates the value of - 16 volts.

a) Determine the value of "E".

b) When the switch "S" is in "position 2".

c) When the switch "S" is in "position 3".

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Problem + Hard 11-4    Source:    Adapted Question 2 - Test of Electrical Circuits - Computer Engineering - UFRGS - 2016.

In the circuit below, find the values ​​of I_y, V_x and V< sub>o

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