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Tatiana [17]
3 years ago
10

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?
Physics
1 answer:
Amanda [17]3 years ago
5 0

Answer:

  R = 0.14  Ω

Explanation:

The resistance of a metal is given by the relation

         R = \rho \frac{L}{A}

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  \frac{2.00}{8.0  \ 10^{-7} }

       R = 1.4 10⁻¹ Ω

       R = 0.14  Ω

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