AQA GCSE Physics QUESTIONS AND ANSWERS

This type of surface is a good absorber and emitter of thermal radiation - Dark, rough (matt) surface This type of surface is a bad absorber and emitter of thermal radiation - Light, shiny surface In this process particles vibrate colliding with each other passing energy along. Solids are best at it, then liquids, then gases. - Conduction In this process particles move around carrying energy with them. Gases are best at it, then liquids then solids - Convection This process doesn't require a medium (substance) to transfer energy. The energy is carried in the form of waves - Radiation Factors affecting the rate of heat transfer - 1. Temperature difference to the surroundings 2. Surface area 3. Nature of surface (e.g shiny/matt) The total energy supplied to a device or an appliance. It is often electrical - Total Input Energy Energy converted by a device into the form(s) the device was designed for. - Useful energy Energy converted by a device into the form(s) the device was NOT designed for. - Wasted energy