A technician records these results before preparing a Sankey diagram for a gas boiler.
| Quantity | Result |
|---|---|
| Energy supplied to the boiler | 64 kJ |
| Energy transferred to the water | 40 kJ |
| Width used for the total energy supplied | 32 mm |
| Number of output branches | 2 |
What width should the technician draw for the branch representing the energy transferred to the surroundings?
12 mm12\ \mathrm{mm}12 mm
20 mm20\ \mathrm{mm}20 mm
24 mm24\ \mathrm{mm}24 mm
0.75 mm0.75\ \mathrm{mm}0.75 mm
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.