Energy

• Energy can be described as being in different 'stores'.
• Energy cannot be created or destroyed.
• Energy can be transferred from one store to another.
• Energy is a quantity that is conserved.
• The amount of energy in the kinetic energy store depends on the speed of the object.
• The amount of energy in the gravitational potential energy store depends on the height of the object.
• The amount of energy in the thermal energy store depends on the temperature of the object.
• The amount of energy in the elastic energy store depends on the amount of extension or compression.
• Energy can be transferred by mechanical working, electrical working, heating and radiation.
• Mechanical working is when a force is applied to move an object through a distance.
• Electrical working is when charge flows (electricity).
• Heating is when energy is transferred between hotter and colder regions.
• Radiation is when energy is transferred as a wave, for example as light or sound.