Physics 0625 · IGCSE · Electric circuits

Electric circuits — practice question

Fig. 10.1 presents a section of the circuit for a hair-dryer connected to a 240 V a.c. supply. The switch has three settings: position A: off (as shown), position B: low heater power, and position C: high heater power. In this hair-dryer, heaters X, Y and Z each have a power of 1000 W when in use. Heaters Y and Z are of equal resistance.
(a)[2]

Calculate the resistance for heater X.

(b)[1]

Calculate the resistance for heater Y.

(c)[2]

Calculate the current in heater Z when the switch is in position C.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct use of $P = V^{2} / R$ OR $V^{2} / P$ in any form” …

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