Two houses, X and Y, are identical except for their walls. The walls are made of the same material, but the walls of house X are thicker.
Both houses are heated to the same temperature and then the heating is switched off.
Which statement is correct?
House Y cools more slowly, because energy is transferred through thinner walls at a lower rate
House X cools more slowly, because energy is transferred through thicker walls at a lower rate
House X cools more quickly, because energy is transferred through thicker walls at a higher rate
Both houses cool at the same rate, because both sets of walls are made of the same material
50 exam-style questions on OCR GCSE Physics 7.2 Power and efficiency, covering 7.2.1 Dissipation of energy, 7.2.2 Energy transfers in domestic devices, 7.2.3 Power ratings of domestic appliances, 7.2.4 Efficiency of energy transfers, 7.2.5 Ways to increase efficiency, 7.2.6 Reducing unwanted energy transfers, and 7.2.7 Thermal conductivity and the cooling of buildings. Each one has a worked solution and a mark scheme showing where the marks go.