Energy Flashcards
Closed System
a system that experiences no net change in its total energy when energy transfers occur within it.
Law of Conservation of energy
Energy can be transferred stored or dissipated but never created or destroyed
Efficiency
The ratio of useful output energy transferred to total energy input
Elastic potential energy
The store of energy that stretched or compressed objects. It is directly proportional to the stiffness constant and to the square of extension or compression
Fossil fuels
Coal oil gas
Gravitational potential energy
The store of energy that all raised matter has is directly proportional to the mass of the object the distance that it is risen and the gravitational field strength at that point
Joule
He units used for energy. Equal to the work done when a force of one Newton acts over a distance
Kinetic energy
the store of energy that all moving matter has. It is directly proportional to the objects mass and to the square of its velocity
Power
The rate at which energy is transferred or at which work is done
What is a Renewable energy resource?
An energy resource that can be replenished whilst it is being used
Specific heat capacity
The amount of energy required to raise the temperature of 1kg of a substance by 1 degree Celsius.
Spring constant
A measure of a springs stiffness. The greater the value the greater the force required to stretch or compress the spring by a given distance
System
A single or group of objects
Thermal conductivity
The higher this value is for a given material the higher the materials rate of energy transfer via conduction will be
Waisted energy
Energy that isn’t usefully used for the purpose of the system
