5.7. Power and Efficiency Flashcards
1
Q
Power
A
- Work done per unit of time
- P = fv
- Work done/Time taken
2
Q
P = W.d/T & W .d. = F s
A
- ∴ P = Fs/T F (s/t)
- ∴ P = F v
3
Q
Efficiency:
A
- Ratio of (useful) output energy of a machine to the input energy
- Efficiency = Total Energy Output/Useful Energy Input X 100
