Four materials are tested in a thermal-conduction rig. Each sample has the same area and thickness, and the temperature difference across each sample is kept the same. The energy transferred through each sample in one second is recorded.
| Material | Energy transferred in one second (J) |
|---|---|
| P | 8 |
| Q | 18 |
| R | 4 |
| S | 12 |
Which material has the greatest thermal conductivity?
Material R
Material Q
Material P
Material S
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.