P1 : Efficiency Flashcards
1
Q
Efficiency
A
The more energy something wastes, the less efficient it is. Energy is wasted by raising the thermal energy-store of the surroundings
Or a measure of how good a device is at changing energy ( or power ) from one form to another
2
Q
Formula for efficiency
A
Efficiency = Useful energy out / Total energy in
Efficiency = Useful power out / Total power in
3
Q
Sankey diagrams
A
Shows you how well a machine uses energy. Thickness of the arrows show how much energy is involved. Useful energy transfers are shown as going left to right, wasteful energy are shown going upwards or downwards
