Energy Transfers And Efficiency Flashcards
1
Q
What happens when energy is transferred
A
Only part of it may be usefully transferred the rest is wasted
2
Q
What happens to wasted energy
A
Eventually is transferred to surroundings, which become warmer
The wasted energy becomes increasingly spread out and so becomes less useful
3
Q
How do you calc the efficiency of a device
A
Useful energy out/total energy in x 100
Or
Useful power out/total power in x100
4
Q
What can energy not be
A
Created or destroyed
