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What is the formula for the equivalent resistance of three resistors connected in series?

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$R = R_{1} + R_{2} + R_{3}$

$R_{s} = \frac{1}{(R_{1} + R_{2} + R_{3})}$

$R_{s} = \frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{1}{R_{3}}$

$R = \frac{(R_{1} + R_{2})}{R_{3}}$

answer is A.

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Detailed Solution

The equivalent resistance of two or more resistors connected in series is equal to the sum of their individual resistances.

Therefore, the equivalent resistance of a series connection of three resistors is given by,
$R = R_{1} + R_{2} + R_{3}$

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