Radiation

This page covers radiation as the third main energy transfer mechanism. It explains how infrared radiation is emitted by objects and how different materials interact with this form of energy transfer.

Definition: Radiation is the transfer of energy through electromagnetic waves, primarily infrared for heat transfer.

Highlight: The page notes that hot objects emit and absorb more infrared radiation than cold objects.

Example: The document compares black and silver objects, explaining their different properties in emitting, absorbing, and reflecting infrared radiation.

Vocabulary: Infrared radiation - A type of electromagnetic radiation responsible for heat transfer without direct contact.

Energy Stores and Equations

This page introduces the fundamental concepts of energy stores and key GCSE Physics equations. It covers various energy stores such as chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic, and nuclear. The page also presents essential equations for calculating kinetic energy, efficiency, thermal energy, elastic potential energy, electrical energy, and gravitational potential energy.

Vocabulary: Specific heat capacity - The amount of energy required to raise the temperature of 1 kg of a substance by 1°C (J/kg°C).

Example: The page provides an example of energy transfer in a camping stove, where chemical energy from fuel is converted to thermal energy.

Highlight: The efficiency equation is presented as (useful energy output / total energy input) × 100, which is crucial for understanding energy conservation and transfer.