Section 4 - Efficiency Flashcards
1
Q
What is a machine?
A
A device which turns one type of energy into another.
2
Q
Why are useful devices useful?
A
Because they can covert energy from one type to another.
3
Q
What always happens when a device converts one form of energy into another?
A
Some of the useful input energy is always lost or waisted. Most of the time this energy is heat.
4
Q
What is the link in between energy efficiency and wasted energy.
A
The less energy that is waisted the more efficient a device.
5
Q
How does an energy flow diagram look?
A
Page 45
6
Q
How do you calculate efficiency?
A
Efficiency = useful energy output / total energy input
