Physics 0625 · IGCSE · Electric circuits

Electric circuits — practice question

Fig. 10.1 presents a circuit with a filament lamp of resistance $0.30\,\Omega$ and two resistors, each having resistance $0.20\,\Omega$.
(a)[3]

Calculate the total resistance of the lamp and the two resistors.

(b)[2]

State and explain any change that occurs in the lamp’s resistance.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply $1/Rp = 1/R1 + 1/R2$ OR $Rp = R1R2/(R1+R2)$.” …

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