Problem 2.1  Source:   Problem elaborated by the author of the site.

Knowing that copper resistivity is 1.69 x 10 ^-2 ohms. mm ² / m and that of aluminum is 2.75 x 10 ^-2 ohms. mm ² / m , what should be the relationship between the areas of the copper and aluminum to have the same resistance, considering the wires with the same length?

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Problem 2.2  Source:   Problem 17 - page 161 -    HALLIDAY, RESNICK, WALKER, Jearl - Book: Fundamentos de Física - Vol 3 - Ed. LTC - 8ª edição - 2009.

An electric wire has 1.0 mm in diameter, 2.0 m in length and a resistance of 50 mΩ. What is the resistivity of the material?

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Problem 2.3  Source:   Problem 18 - page 161 -    HALLIDAY, RESNICK, WALKER, Jearl - Book: Fundamentos de Física - Vol 3 - Ed. LTC - 8ª edição - 2009.

A certain wire has a resistance R. What is the resistance of a second wire, made of the same material, with half of the length and half of the diameter?

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Problem 2.4  Source:   Problem 21 - page 161 -    HALLIDAY, RESNICK, WALKER, Jearl - Book: Fundamentos de Física - Vol 3 - Ed. LTC - 8ª edição - 2009.

A wire with a resistance of 6.0 ohms is stretched in such a way that its length makes it three times larger than the original. Determine the wire resistance after operation assuming that the resistivity and density of the material remain unchanged.

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Problem 2.5   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance R_eq, between the a-b points of the circuit shown in Figure 02-05.1.

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Problem 2.6   Source:   Problem elaborated by the author of the site.

In the circuit shown in Figure 02-06.1 find the equivalent resistance seen from the terminals a-b.

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Problem 2.7   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points a-b of the circuit shown in Figure 02-07.1.

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Problem 2.8   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points a-b of the circuit shown in Figure 02-08.1.

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Problem 2.9   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points a-b of the circuit shown in Figure 02-09.1.

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Problem 2.10   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points A-B of the circuit shown in Figure 02-10.1.

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Problem 2.11   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points x-y of the circuit shown in Figure 02-11.1.

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Problem 2.12   Source:   Problem elaborated by the author of the site.

In the circuit shown in the Figure 02-12.1, find the equivalent resistance between the following terminals:

a) A-D.

b) C-E.

a) B-D when the C-E terminals are short-circuited.

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Problem 2.13   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the points A-E of the circuit shown in Figure 02-13.1.

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Problem 2.14   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the B-E points by considering the shorted D-E points, as shown in Figure 02-14.1

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Problem 2.15   Source:   Problem elaborated by the author of the site.

Calculate the resistance that the circuit offers to the V voltage source in the circuit shown in Figure 02-15.1.

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Problem 2.16   Source:   Institute of Physics - Ufrgs - Basic Eletronic discipline - List of exercises - Prof. Dr. Francis

In the circuit shown in Figure 02-16.1 find the equivalent resistance seen from the terminals a-b when:

a) the c -d terminals are open.

b) the c -d terminals are closed.

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Problem 2.17   Source:   Problem 3.8b - page 55 - NILSSON & RIEDEL - Book: Circuitos Elétricos - 8ª edição - Ed. Pearson - 2010

Calculate the equivalent resistance between the a-b points of the circuit shown in Figure 02-17.1.

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Problem 2.18   Source:   Problem elaborated by the author of the site.

Calculate the value of R in the circuit shown in Figure 02-18.1, so that R_ab = R_x.

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Problema 2.19   Source:   Adapted of the Exercicie 2.31 - page 65 - THOMAS, Roland E. & ROSA, Albert J. & TOUSSAINT, Gregory J. - Book: The Analysis and Design of Linear Circuits - 6ª edição - Ed. John Wiley & Sons, Inc. - 2009.

In the circuit shown in the Figure 02-19.1, find the equivalent resistance between the following terminals:

a) A-B

b) A-C

a) B-D

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Problem 2.20   Source:   Problem elaborated by the author of the site.

Calculate the equivalent resistance between the a-b points of the circuit shown in Figure 02-20.1.

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