Understanding Sankey Diagrams and Energy

The video tutorial explains Sankey diagrams, which visually represent energy efficiency during energy transfers. Using a light bulb example, the teacher demonstrates how to create a Sankey diagram, emphasizing the importance of arrow widths to represent energy distribution. The tutorial covers the steps to draw the diagram, including choosing a scale and understanding the significance of the arrows' thickness.

What is the primary purpose of a Sankey diagram?

• To display the timeline of historical events

• To illustrate energy efficiency during energy transfers

• To map out geographical locations

• To show the flow of money in a business

In the light bulb example, how much energy is supplied to the bulb?

• 80 joules

• 50 joules

• 100 joules

• 120 joules

What percentage of the light bulb's energy is converted into light?

• 80%

• 50%

• 20%

• 10%

When starting a Sankey diagram, what is the first step?

• Drawing the arrows

• Calculating the efficiency

• Choosing the color scheme

• Identifying the input energy

Why is scale important when drawing a Sankey diagram?

• To make the diagram look complex

• To make the diagram colorful

• To accurately represent the amount of energy

• To ensure the diagram fits on the page

What does the width of the arrows in a Sankey diagram represent?

• The amount of energy

• The speed of energy transfer

• The color of the energy

• The direction of energy flow

In the diagram, what does the downward arrow represent?

• Wasted energy

• Useful energy

• Input energy

• Stored energy

How wide should the arrow be for 80 joules of wasted energy?

• 10 centimeters

• 8 centimeters

• 6 centimeters

• 4 centimeters

What is the significance of the point where the arrows branch off in a Sankey diagram?

• It marks the midpoint of the diagram

• It represents the division between useful and wasted energy

• It indicates the end of the process

• It shows the start of the diagram

What is the final step in completing a Sankey diagram?

• Drawing the branching arrows

• Coloring the arrows

• Calculating the total energy

• Labeling the energy types