Efficiency

Question 1

What is efficiency defined as?

Answer 1

The ratio of the useful energy output from a system to its total energy output

Question 2

What does it mean if a system has a high r low efficiency?

Answer 2

If a system has high efficiency, this means most of the energy transferred is useful
If a system has low efficiency, this means most of the energy transferred is wasted

Question 3

What is the equation for efficiency (as a percentage)?

Answer 3

[useful energy output/total energy output) X 100

Question 4

Describe the different parts of the arrow in a Sankey diagram

Answer 4

The different parts of the arrow in a Sankey diagram represent the different energy transfers:
The left-hand side of the arrow (the flat end) represents the energy transferred into the system
The straight arrow pointing to the right represents the energy that ends up in the desired store; this is the useful energy output
The arrows that bend away represent the wasted energy