Energy And The Future Flashcards
1
Q
Total energy supplied =
A
Total energy used (useful+wasted)
2
Q
Efficiency=
A
Useful output/ total input x100
3
Q
How does an object cool down
A
When an object is hotter than the surroundings it it emits more radiation allowing it to cold down
4
Q
How does an object warm up
A
When the object is colder than the surroundings it absorbs the heat from outside
5
Q
What do dark matt surfaces do
A
They absorb heat radiation falling on them they also emit much more radiation
6
Q
How do solar hot water panels work
A
They contain water pipes under a black surface
Heat radiation from the sun is absorbed by the black surface and heats the pipes
7
Q
How do survival blankets work
A
Silver reflects most heat radiation so it reflects the heat back into the person wrapped in the blanket
