Question

Two resistors having resistance 20 ohms and 25 ohms are connected in parallel. Find the effective resistance ?​

Answer 1

Explanation:

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Answer 2

Given : Two resistors having resistance 20 ohms and 25 ohms are connected in parallel.

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Answer:

$:\implies \rm \dfrac{1}{R_{eff}} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + .......$

$:\implies \rm \dfrac{1}{R_{eff}} = \dfrac{1}{20} + \dfrac{1}{25}$

$:\implies \rm \dfrac{1}{R_{eff}} = \dfrac{25 + 20}{20 \times 25}$

$:\implies \rm \dfrac{1}{R_{eff}} = \dfrac{45}{500}$

$:\implies \rm \dfrac{1}{R_{eff}} = \dfrac{9}{100}$

$:\implies \red{ \rm R_{eff} = \dfrac{100}{9} \:\Omega }$