P1.2.1 Energy Trasfers And Efficiency Flashcards
1
Q
Efficiency
A
Useful energy/ power out
————————– X 100%
Total energy/ power in.
2
Q
Energy transportation
A
When energy is transferred only part of it may be usefully transferred, the rest is ‘wasted’.
3
Q
Energy surroundings
A
Wasted energy is eventually transferred to the surroundings, which become warmer. The wasted energy becomes increasingly spread out and so become less useful.
4
Q
The law of conservation of energy
A
Energy cannot be created or destroyed only transferred
