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ohaa [14]
3 years ago
5

¿Qué resistencia debe ser conectada en paralelo con una de 20 Ω para hacer una

Physics
1 answer:
Lisa [10]3 years ago
6 0

Answer:

La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una  resistencia combinada de 15 Ω tiene un valor de 60 Ω

Explanation:

Las resistencias son aquellos dispositivos en los circuitos eléctricos que suelen emplearse para oponerse al paso de la corriente eléctrica.

Se denomina resistencia resultante o equivalente al valor de la resistencia que se obtiene al considerar un conjunto de ellas.

Cuando tenes resistencias en paralelo la corriente se divide y circula por varios caminos.

La resistencia equivalente de un circuito de resistencias en paralelo es igual al recíproco de la suma de los inversos de las resistencias individuales:

R=\frac{1}{\frac{1}{R_{1} } +\frac{1}{R_{2} } +...+\frac{1}{R_{N} }}

Esto también puede ser expresado como:

\frac{1}{R} =\frac{1}{R_{1} } +\frac{1}{R_{2} } +...+\frac{1}{R_{N} }

Entonces, en este caso sabes:

  • R= 15 Ω
  • R1= 20 Ω
  • R2=?

Reemplazando:

\frac{1}{15} =\frac{1}{20}+\frac{1}{R2}

y resolviendo:

\frac{1}{R2} =\frac{1}{15} -\frac{1}{20}

\frac{1}{R2} =\frac{1}{60}

se obtiene:

R2=60 Ω

<u><em>La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una  resistencia combinada de 15 Ω tiene un valor de 60 Ω</em></u>

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