Conservation Of Energy Flashcards
What is the conservation of energy principle
Energy can be transferred usefully, stored or dissipated but can never be created or destroyed
What happens to some of
The energy always when energy transfer takes place
Some is always dissipated
What is dissipated energy sometimes called and why
Wasted energy
because the energy is being stored in a way that’s not useful
Example of energy being dissipated
A mobile phone is a system
Energy is usefully transferred from the chemical energy store of the battery, some of this is dissipated to the thermal energy store
Give an example of energy transfer for closed systems
A cold spoon dropped into an insulated flask of hot soup, which is sealed - closed system
Energy is transferred from the thermal energy store of the soup to the useless thermal energy store of the spoon
No energy has left the system so the net change in energy is ZERO
