Which one of the following gives the equivalent resistance of three resistors…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Which one of the following gives the equivalent resistance

R_{\text{p}}

of three resistors

R_1,\,R_2,\,R_3

connected in parallel? (a)

\displaystyle R_{\text{p}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}

(b)

\displaystyle \frac{1}{R_{\text{p}}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}

(c)

\displaystyle R_{\text{p}}=\frac{R_1 R_2 R_3}{R_1+R_2+R_3}

(d)

\displaystyle \frac{1}{R_{\text{p}}}=R_1+R_2+R_3

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