Physics

Problem

Which expression gives the equivalent resistance

R_{\text{eq}}

of three resistors

R_1, R_2,

and

R_3

connected in parallel? a)

R_{\text{eq}} = \dfrac{R_1R_2+R_2R_3+R_3R_1}{R_1R_2R_3}

R_{\text{eq}} = \dfrac{R_1R_2}{R_1+R_2}+R_3

\dfrac{1}{R_{\text{eq}}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}

R_{\text{eq}} = \dfrac{R_1+R_2+R_3}{3}