Thermal Transfer Basics

IGCSE Edexcel Physics
4.6-4.10 Thermal Transfer
Key Concepts: Thermal energy transfers by conduction, convection, and radiation. Surfaces affect emission and absorption.

Section A: Methods

1. Describe conduction with one example. [2]
2. Describe convection with one example. [2]
3. Describe radiation with one example. [2]

Section B: Surfaces

4. State how shiny and dull surfaces differ in emission and absorption. [3]
5. Describe one way to reduce heat loss in a house. [2]
Total marks: 11

Mark Scheme

1. Conduction through solids by particle collisions [2]
2. Convection in fluids by movement of warmer, less dense fluid [2]
3. Radiation by infrared waves [2]
4. Dull/dark surfaces emit and absorb more; shiny/light emit and absorb less [3]
5. Any correct method: insulation, double glazing, draught excluders [2]