Lesson: Sankey Diagrams Physics

In this lesson, we will learn how to correctly draw and interpret Sankey diagrams for processes that involve the transfer of energy.

Lesson Video

Lesson Worksheet

Q1:

The image shows a Sankey diagram for a light bulb that is supplied with 100 J of energy, where 80 J of energy is wasted as heat. What is the useful energy output of the bulb?

Q2:

The image shows a Sankey diagram for a fluorescent light. What is the input power of the fluorescent light?

Q3:

The image shows a Sankey diagram of a 100 W light bulb.

What does 1 square of the diagram represent?

How much energy is wasted as heat by the light bulb?

What is the efficiency of the light bulb?