Efficiency Flashcards
0
Q
2) The total energy input is equal to…?
A
The total energy output (however only some of it is useful)
1
Q
1) Useful machines are only useful because…?
A
They convert energy from one form into another
2
Q
3) The total energy output is always a fraction of the total energy input because…?
A
Energy is lost or wasted (often as heat)
3
Q
4) The less energy wasted…?
A
The more efficient the device is said to be
4
Q
5) What is the formula for efficiency?
A
Efficiency = useful energy output divided by total energy input x (100)
5
Q
6) Give a practical example of an object converting energy with a level of efficiency
A
A car (converts chemical energy into kinetic)
