State the correct expression for the equivalent resistance of three resistors and…

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

Problem

State the correct expression for the equivalent resistance ReqR_{\text{eq}} of three resistors R1,R2R_1, R_2 and R3R_3 connected in series. (a) Req=R1R2+R2R3+R3R1R1+R2+R3R_{\text{eq}} = \dfrac{R_1 R_2 + R_2 R_3 + R_3 R_1}{R_1 + R_2 + R_3} (b) Req=R1+R2+R3R_{\text{eq}} = R_1 + R_2 + R_3 (c) Req=R1+R2+R33R_{\text{eq}} = \dfrac{R_1 + R_2 + R_3}{3} (d) 1Req=1R1+1R2+1R3\dfrac{1}{R_{\text{eq}}} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + \dfrac{1}{R_3}

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