Energy Flashcards
(40 cards)
what is the unit of energy?
Joule
System:
a connected set of resources and processes
The law of conservation of energy:
the law that states energy can neither be created or destroyed. Only transferred e.g. solar energy or transformed e.g. hydroelectricity
useful energy
when energy is captured for a purpose
wasteful energy:
When energy is produced as a side effect and lost from a system
Energy efficiency formula
Efficiency of energy use = useful energy output / total input energy x 100/1 %
Qualitative measurements:
measurement that we describe such as hot, cold
Quantitive measurements:
measurements that we can give a numeric value to such as degrees celsius, metres, hertz etc.
What are the two scales for measuring temperature:
- Degrees celsius
2. Kelvin
How to calculate Kelvin:
temperature (K) = temperature C + 273
what is thermal energy?
the energy of the particles of which a substance is made; heat energy
What is thermal equilibrium?
the result of two interacting systems coming to the same temperature
what is conduction?
The transfer of heat energy by direct contact between particles in systems (occurs in solids)
What is convection?
the bulk movement of a fluid that carries thermal energy from a system
what is radiation?
The infrared electromagnetic radiation that carries thermal energy from a system.
input:
a resource that flows into a system
output:
the intended product of a system
local system:
a defined system connected to other systems
surrounding system:
the immediate system into which emissions from a local system are transferred
universe:
the ultimate system
Kinetic energy:
energy of movement
potential energy:
energy other than kinetic energy that is ready to be transferred or transformed
calibration points:
a value of a quantity that is used to define a scale
car safety systems:
all safety systems transfer and transform energy so that it has the least dangerous effect on people.
