Energy stores Flashcards
A system
an object or a group of objects and when it is changed the energy stored is also changed.
Kinetic energy store
Gravitational energy store
Elastic potential energy store
the type of energy stored in a spring when stretched
Specific Heat Capacity
The energy required to increase the temperature of 1kg of substance by 1oC or 1K
Power
the rate at which energy is transferred or the rate at which work is done
Law of Conservation of Energy
Energy can neither be created nor destroyed - only converted from one form of energy to another
Reducing energy waste:
Lubrication:
.Oil in a motor
.reduces friction
.less energy is lost as heat through friction
Thermal Insulation:
.Double Glazing
.less useful thermal energy lost
Thermal Conductivity
The higher the thermal conductivity of a material, heat is allowed to travel through the
material more easily, so the higher the rate of energy transfer by conduction across the
material.
Example of Thermal Conductivity
Thermal Conductivity in a building
.Rate of cooling is low if walls are thick and thermal conductivity of the walls are low
. If the walls are thin metal sheets, heat would be lost very quickly.
Efficency
