Energy

• Energy is the ability to do work.
• Energy is also needed to make heat and light.
• What is chemical energy?


  It is the energy stored in foods we eat and oil used to run vehicles and machinery.
• What is thermal energy?

  It is the energy that keeps us warm, produced by hot objects.
• What is sound energy?

  It is the energy that we can hear.
• What is light energy?

  It is the energy that can help us see.
• What is geothermal energy?

  It is the energy found in hot underground rocks.
• What is kinetic energy?

  It is the energy possessed by moving objects.
• What is Gravitational Potential Energy (GPE)?

  It is the energy possessed by an object because of its position above the ground.
• What is elastic potential energy?

  It is the energy possessed by stretched or compressed springs.
• Energy stores can be stored in different ways, e.g:

  • Kinetic- movement or motion in an object
  • Gravitational- this is due to the position of the object above the ground
  • Elastic- energy already stored in a stretched spring or elastic band
  • Magnetic- energy due to the forces of attraction between two magnets
• • Chemical- energy held in chemical bonds, e.g foods, fuels or batteries
  • Nuclear- energy contained within the nucleus of an atom
  • Thermal- energy due to it's temperature
• Gravity is a force of attraction between two objects.
• The principle of conservation of energy states that: Energy cannot be created or destroyed but it can only be transferred from one store to another.
• Efficiency is defined as the ratio of the useful energy transferred by the device to the total energy supplied to the device.
• Sankey diagrams are used to represent energy transfer in a system.