An architect compares three designs for the outside walls of a building.
Each wall has the same area. The temperature difference across each wall is the same.
The Table shows information about the walls.
Table
| Design | Material | Thickness in cm\text{cm}cm | Thermal conductivity in W/m K\text{W/m K}W/m K |
|---|---|---|---|
| A | brick | 20 | 0.70 |
| B | brick | 30 | 0.70 |
| C | timber | 20 | 0.15 |
Explain why design A would give a higher rate of cooling of the building than either design B or design C.
Explain why the information in the Table does not allow the architect to decide whether design B or design C gives the lower rate of cooling.
Explain why reducing the rate of cooling of the building reduces the energy that the heating system must supply each day.
100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.