A storage heater contains a large block of material. The block is heated at night. During the day, the block transfers energy to the room.
The Table shows the specific heat capacity of some materials.
Table
| Material | Specific heat capacity in J/kg ∘C\text{J/kg}\ ^{\circ}\text{C}J/kg ∘C |
|---|---|
| aluminium | 900 |
| brick | 840 |
| concrete | 880 |
| copper | 390 |
| water | 4200 |
A storage heater contains 120 kg of brick. At night, the temperature of the brick rises from 20 ∘C20\ ^{\circ}\text{C}20 ∘C to 70 ∘C70\ ^{\circ}\text{C}70 ∘C.
Calculate the energy transferred to the brick.
Use the equation
ΔQ=m×c×Δθ\Delta Q = m \times c \times \Delta \thetaΔQ=m×c×Δθ
A student says that water would be better than brick for the storage heater.
Give one advantage and one disadvantage of using water instead of brick.
The same energy is transferred to 120 kg of copper.
Explain whether the temperature rise of the copper is greater or smaller than the temperature rise of the brick.
Calculate the temperature rise of the copper.
Use your answer to (a).
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.