Topic 6 - Energy and the future Flashcards
1
Q
What is electrical energy?
A
whenever a current flows
2
Q
What are the 8 types of energy?
A
light sound kinetic nuclear thermal gravitational potential elastic potential chemical
3
Q
how do you work out how efficient something is?
A
useful energy output
——————————– x 100
total energy input
4
Q
does an object that is hotter than its surroundings emit more radiation or absorb more?
A
emit more (as it cools down)
5
Q
does an object that is cooler than its surroundings emit more radiation or absorb more?
A
absorb more (as it warms up)
6
Q
What is power?
A
rate of energy charge. energy/time
7
Q
what kind of surface absorbs heat?
A
dark matt
8
Q
what kind of surface reflects heat?
A
shiny silvered
