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CAIE IGCSE Physics 1.7.3.3 Understand Qualitatively the Concept Questions

Practise calculating and evaluating efficiency as useful energy output divided by total input energy using CAIE IGCSE Physics questions and mark schemes.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Calculate and evaluate efficiency as useful energy output divided by total input energy.

CAIE IGCSE Physics 1.7.3.3 Understand Qualitatively the Concept Questions question 1

[Maximum number: 1]

Fig. 4.1 shows a stainless-steel saucepan being heated on an electric cooker. The saucepan contains water.

Fig. 4.1

Fig. 4.1

The saucepan contains 250 cm3250 \mathrm{~cm}^{3} of water. The specific heat capacity of water is 4200 J/(kg∘C)4200 \mathrm{~J} /\left(\mathrm{kg}^{\circ} \mathrm{C}\right). The density of water is 1000 kg/m31000 \mathrm{~kg} / \mathrm{m}^{3}.

The heater supplies enough power to heat the water in 39 s . A student measures the time taken to heat the water as 115 s .

Suggest why the actual time taken to heat the water is longer. Assume that the student takes accurate measurements.

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