Edexcel IGCSE Physics: Double Science 复习笔记：4.1.1 Energy Stores & Transfers

• Energy can be stored in different ways, and there are changes in the way it is stored when a system changes

• There are many different ways that energy can be stored, these are shown in the table below:

Types of Energy Stores Table

• A system can change between stores through different energy transfer mechanisms
• Examples of these are:
  • Mechanical
  • Electrical
  • Heating
  • Radiation

   

• These are described in the table below:

Types of Energy Transfers Table

• An example of a thermal energy transfer is a hot coffee heating up cold hands

Thermal energy is transferred from the hot coffee to the mug and to the cold hands

Part (a)

• • For a falling object:

   

Energy is transferred from the gravitational store to the kinetic store of the object via a mechanical transfer pathway

Part (b)

• • For a battery powering a torch:

   

Energy is transferred from the chemical store of the battery to the thermal store of the surroundings via a radiation transfer pathway

Part (c)

• • For a mass on a spring:

   

Energy is transferred from the elastic store to the kinetic store of the system via a mechanical transfer pathway