Answered

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Una bombilla de incandescencia tiene un filamento de wolframio cuya resistividad es de 5,6 por 10 a la -8 m , su longitud es de 200 cm y su sección es de 8,0 por 10 a la -7 malcuadrado ¿resistencia?

Sagot :

Answer:

  R = 0.14  Ω

Explanation:

The resistance of a metal is given by the relation

         R = [tex]\rho \frac{L}{A}[/tex]

where ρ the resistivity is 5.6 10-8 Ω m, they also give the length and the cross section (area)

Let's reduce the magnitudes to the SI system

        L = 200cm (1m / 100cm) = 2.00m

        A = 8.0 10⁻⁷ m²

let's calculate

       R = 5.6 10⁻⁸  [tex]\frac{2.00}{8.0 \ 10^{-7} }[/tex]

       R = 1.4 10⁻¹ Ω

       R = 0.14  Ω

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