A conservation centre uses an incubator to keep reptile eggs warm. Energy is transferred by conduction through an insulating layer around the incubator.
The area of the layer and the temperature difference between its surfaces are kept constant. A designer considers:
Which option gives the effect of each change on the rate of energy transfer from the incubator?
Increasing the thickness: the rate decreases; using a lower thermal conductivity: the rate increases
Increasing the thickness: the rate increases; using a lower thermal conductivity: the rate increases
Increasing the thickness: the rate decreases; using a lower thermal conductivity: the rate decreases
Increasing the thickness: the rate increases; using a lower thermal conductivity: the rate decreases
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.