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Energy Transfer Questions - GCSE Level

Q4. The diagram shows potatoes being baked in a gas oven. Each potato has a metal skewer pushed through it.

(a) Explain how heat is transferred by the process of convection from the gas flame at the bottom of the oven to the potatoes at the top of the oven. (3 marks)

(b) The metal skewers help the potatoes to cook by transferring heat to the inside of the potatoes. By what method is heat transferred through a metal skewer? (1 mark)

(c) When the potatoes are taken from the oven, they start to cool down. Suggest one factor that will affect how fast a potato cools down. (1 mark)

(d) If the potatoes need to be kept hot, they may be wrapped in shiny aluminium foil. Why does this help to keep the potatoes hot? (1 mark)

(6 marks total)