Exercise 2 We consider the following circuit: P₂ B 1. Draw the Thevenin equivalent generator from node A and B. 2. Express Eth as a function of U, R₁, R₂ and R3. Numerical application: U = 5V, R₂ = R₂ = R3 = 10 kn. 3. Give the corresponding Norton generator.

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Exercise 4

Exercise 2
We consider the following circuit:
P₂
B
1. Draw the Thevenin equivalent generator from node A and B.
2. Express Eth as a function of U, R₁, R₂ and R3. Numerical application:
U = 5V, R₁ = R₂ = R3 = 10 k.
3. Give the corresponding Norton generator.
Exercise 3
1/8
Remember that the concentration of free electrons in a metal with atomic mass
A, density d and valence v (number of free electrons per atom) is given by the
relation n = where N is the Avogadro's number.
Ndv
1. We consider an aluminum wire (A = 27), density d = 2.7 g. cm ³,
resistivity 3.44 u. cm. Calculate the concentration of free electrons
(number per m³).
2. Determine the mobility of free electrons in the international system.
Exercise 4
A copper wire of diameter D = 1mm is crossed by an intensity of 2A. knowing
that the electron concentration is 8.45x1028 m3, determine the rate at which the
electrons are drawn. It is assumed that the wire is 2.5 m long and that it is
subjected to a potential difference of 0.1 V. Then calculate the mobility of the
electrons and deduce the conductivity of the wire.
Transcribed Image Text:Exercise 2 We consider the following circuit: P₂ B 1. Draw the Thevenin equivalent generator from node A and B. 2. Express Eth as a function of U, R₁, R₂ and R3. Numerical application: U = 5V, R₁ = R₂ = R3 = 10 k. 3. Give the corresponding Norton generator. Exercise 3 1/8 Remember that the concentration of free electrons in a metal with atomic mass A, density d and valence v (number of free electrons per atom) is given by the relation n = where N is the Avogadro's number. Ndv 1. We consider an aluminum wire (A = 27), density d = 2.7 g. cm ³, resistivity 3.44 u. cm. Calculate the concentration of free electrons (number per m³). 2. Determine the mobility of free electrons in the international system. Exercise 4 A copper wire of diameter D = 1mm is crossed by an intensity of 2A. knowing that the electron concentration is 8.45x1028 m3, determine the rate at which the electrons are drawn. It is assumed that the wire is 2.5 m long and that it is subjected to a potential difference of 0.1 V. Then calculate the mobility of the electrons and deduce the conductivity of the wire.
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