Energy Resources and Transfers Flashcards
Acronym for types of energy and energy transfer
GECK MENT HERM
What does GECK MENT HERM stand for?
Types of Energy and Energy Transfer:
Gravitational
Elastic
Chemical
Kinetic
Magnetic
Electrostatic
Nuclear
Thermal
Heating
Electrically
Radiation
Mechanically
Energy is always…
…conserved
Efficiency =
(Useful energy output)/(Total Energy Input) x 100
Sankey Diagram shows
Energy input and useful and not useful outputs
Conduction is when thermal energy
in liquids and solids is transferred via vibration of particles
Non-metals are usually
poor conductors
Process of conduction
- Substance heated
- Molecules vibrate
- Molecules hit adjacent molecules which in turn vibrate and heat
- This transfers heat heat energy from hot parts to cooler parts
Convection is when thermal energy
in liquids and gases is transferred by molecules moving from an area of high thermal energy to an area of low thermal energy
Process of convection
- Fluid heated causing expansion
- This makes the fluid less dense
- This less dense fluid rises replacing denser/colder fluid
Radiation is when thermal energy
is transferred by infrared radiation
Radiation does not require a
medium
Best absorbers and emitters are
black, dull bodies
Best reflectors are
white, shiny bodies
Radiation emitted is directly proportional to
surface area and surface temperature
