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2 marksTransfer of Thermal Energy

CSEC Physics · May/June 2007 · Paper 2 · Question 3(a)(iii)

Figure 2 shows a shiny kettle on a gas stove heating water.

How does the cover prevent heat losses?

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Other parts of this question

  1. 3(a)(i)By what process is heat transferred to the water through the kettle?[1 mark]
  2. 3(a)(ii)Explain why kettles are usually shiny on the outside.[1 mark]
  3. 3(b)Only about one-third of the thermal energy generated by burning the gas goes into heating the water, whilst the remainder is wasted. State where the wasted…[2 marks]
  4. 3(c)If the mass of water in the kettle is 1.5 kg, calculate the thermal energy required to raise its temperature from 30 °C to 100 °C.[3 marks]
  5. 3(d)How much more energy must the water absorb for 0.2 kg of it to boil off?[3 marks]
  6. 3(e)Explain why it is better not to fill the kettle when making one or two cups of tea.[2 marks]

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