Which one of the following expressions gives the potential difference across the…

PHYSICS · Single correct · IGCSE · Physics · Electricity and magnetism · Electricity and magnetism

Problem

Which one of the following expressions gives the potential difference across the third resistor

R_3

when resistors

R_1, R_2

and

R_3

are connected in series to a battery of emf

V

? (a)

V_3 = V \dfrac{R_3}{R_1 + R_2}

(b)

V_3 = V \dfrac{R_1 + R_2}{R_3}

(c)

V_3 = V \dfrac{R_3}{R_1 + R_2 + R_3}

(d)

V_3 = V \dfrac{R_3}{R_1 R_2}