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2.2 Thermal properties and temperature

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Question 29

An electric kettle contains water at a temperature of 22∘C22^\circ\text{C}22∘C. The kettle has a power rating of 2.4 kW2.4\text{ kW}2.4 kW and is switched on for 4.0 minutes4.0\text{ minutes}4.0 minutes.

a.

Calculate the energy supplied to the kettle by the electricity supply.

[2]
b.

At 4.0 minutes4.0\text{ minutes}4.0 minutes, the temperature of the water reaches 100∘C100^\circ\text{C}100∘C. The volume of the water in the kettle is 1500 cm31500\text{ cm}^31500 cm3 and its density is 1.0 g/cm31.0\text{ g/cm}^31.0 g/cm3. The specific heat capacity of water is 4200 J/(kg∘C)4200\text{ J}/(\text{kg}^\circ\text{C})4200 J/(kg∘C).

Calculate the thermal energy gained by the water.

[4]
c.

Calculate the efficiency of the kettle.

[2]
Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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