Sankey diagrams

Where does most of the energy go in this transformation.

• Electrical energy
• Light
• Heat
• other

Where does most of the energy go for this transformation.

• heat
• electrical
• light
• joules

Efficiency is...

• The percentage of energy that is actually used to do work
• The stuff in the walls that keeps energy in

The wasted energy in this diagram:

• is the bottom arrow.

• is the green arrow.

• is made of three types of energy.

• is the longest arrow.

Which of the following is NOT a form of energy?

• movement
• body mass
• heat
• food

In a coal fired power station the first step is to burn coal to heat water. Which Sankey diagram could be used to represent this step?

• 
• 
• 
• 

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

• 5%

• 50%

• 55%

• 100%

The energy efficiency shown in this diagram is:

• About 10%.

• About 30%.

• About 60%.

• Impossible to tell.

Assume there are 10 pieces of energy.  Which is a close approximation to the number of pieces that transform into kinetic energy?

• 1
• 3
• 6
• 10

What is energy measured in?

• Joules
• Watts
• kilograms
• Newtons