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Conservation of energy
Energy cannot be created or destroyed
Efficiency
Useful energy transferred by a device ÷ total energy supplied to the device
Useful energy
Energy transferred to where it it is wanted in the way it is wanted
Wasted energy
Energy that is not usefully transferred
Elastic potential energy
The energy associated with a stretched or compressed object
Gravitational potential energy
The energy associated with the height of an object above the ground
Kinetic energy
The energy associated with the speed of an object
Thermal / Heat energy
The energy associated with the temperature of an object
Dissipation
the spreading out of energy into the environment
Insulation
Material that reduces the rate of thermal energy transfer by conduction
Renewable resource
An energy resource that is replaced over time, and will not run out
Non-renewable resource
An energy resource that is not replaced over time, and will run out
Fossil fuels
Coal, oil, and natural gas
Nuclear energy
Energy stored in the nucleus of an atom
Biofuels
a fuel derived directly from living matter.
Hydroelectric energy
Electrical energy produced by falling water
Geothermal energy
Heat energy that comes from the natural radioactive decay of elements deep within Earth.
Tidal energy
Energy generated by the movement of the tides
Wave Power
power obtained by harnessing the energy produced by waves at sea.
Solar energy
energy from the sun that is converted into thermal or electrical energy
Conduction
Form of heat transfer where heat energy is directly transferred between molecules through molecular collisions or direct contact.
Thermal Conductivity
The ability of an object to conduct heat
Cavity wall insulation
Insulation material that is used to fill the cavity between the two brick layers of an external house wall
Double Glazing
windows that have two layers of glass to keep a building warm
Control Variable
A variable that is kept constant during a experiment.
Independent variable
variable that is changed
Dependent variable
variable that is measured
Global warming
A gradual increase in average global temperature
Carbon dioxide
gas that contributes to the greenhouse effect and global warming
Chemical energy
energy stored in a battery, fuel or food
