Energy Transfer

Question 0

How can thermal energy be transferred?

Answer 0

Conduction, Convection and Radiation

Question 1

Conservation of energy

Answer 1

Energy cannot be created or destroyed, only transferred from one form to another

Question 2

Conduction

Answer 2

The transfer of KE through a substance from molecules to neighbouring molecules through collisions.
Air-good insulator

Question 3

Convection

Answer 3

The transfer of Thermal energy (KE) through a fluid through movements of whole regions of fluid.
A region of fluid is heated and the molecules move around faster so it expands so its density decreases so it rises, taking the KE with it. Less dense fluid falls to replace it creating a convection current.

Question 4

Radiation

Answer 4

The transfer of thermal energy using electromagnetic waves (infra red).
Important points:
Can travel through a vacuum
Dull, dark surfaces=good emitters AND absorbers of radiation, shiny opposite.

Question 5

GPE

Answer 5

mgh

Question 6

KE

Answer 6

1/2mv²

Question 7

GPE and KE

Answer 7

GPE lost=KE gained

Question 8

Efficiency

Answer 8

useful energy(/power) output/total energy(/power) output 
Energy conversion is 100% efficient

Question 9

Sankey diagrams

Answer 9

See book