Question

Find the equivalent resistance for 20ohm 15ohm and 20ohm parallel conecetion​

Answer 1

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GIVEN :-

Three resistors of 20Ω , 15Ω , 20Ω.

TO FIND :-

The equivalent resistance.

SOLUTION :-

Let R₁ be 20Ω R₂ be 15Ω R₃ be 20Ω.

Now as we know that , when the resistors are connected in parallel combination then their equivalent resistance is given by,

$\\ : \implies \displaystyle \sf \: \frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + ... + \frac{1}{R_n}$

$: \implies \displaystyle \sf \: \frac{1}{R_{eq}} = \frac{1}{20} + \frac{1}{15} + \frac{1}{20}$

$: \implies \displaystyle \sf \: \frac{1}{R_{eq}} = \frac{3 + 4 + 3}{60}$

$: \implies \displaystyle \sf \: \frac{1}{R_{eq}} = \frac{10}{60}$

$: \implies \displaystyle \sf \: \frac{1}{R_{eq}} = \frac{1}{6}$

$: \implies \displaystyle \underline{ \boxed{\sf \bold{ \: {R_{eq}} = 6 \: \Omega}}}$