Energy stores and systems

• Energy Stores

  • Thermal Energy Stores
  • Kinetic Energy Stores
  • Gravitational Potential
  • Elastic Potential
  • Chemical
  • Magnetic
  • Electrostatic
  • Nuclear
• When a system changes, energy will be transferred
• The net change in the total energy of a system is zero
• Energy can be transferred by heating
• Energy can be transferred by work
• Work is just another way of saying energy transferred
• Work can be done when an object moves and a force is applied
• Work can be done when current flows
• Kinetic and Potential Energy Stores


  Any store where energy is moving
• When an object speeds up

  Energy is transferred away from the kinetic energy store
• When an object slows down

  Energy is transferred to the kinetic energy store
• Kinetic Energy


  Depends on the object's mass and speed
• Gravitational Potential Energy


  Energy transferred to the gravitational field when an object is lifted
• Energy lost from the gravitational potential energy store


  Energy gained in the kinetic energy store
• Elastic Potential Energy


  Energy stored in an object when it is stretched or squashed