Sankey diagrams

Front

What is a Sankey diagram?

Back

A Sankey diagram is a flow diagram that visually represents the flow of energy, materials, or costs in a system, with the width of the arrows proportional to the flow quantity.

Front

What units are used to measure energy?

Back

Joules (J) are the standard unit for measuring energy.

Front

How do you calculate efficiency?

Back

Efficiency = (Useful Energy Output / Total Energy Input) x 100%.

Front

If a charger converts 75J of electricity into 50J of charge and 25J of thermal energy, what is its efficiency?

Back

67%.

Front

True or False: Energy can be created and destroyed.

Back

False. Energy cannot be created or destroyed; it can only be transformed from one form to another.

Front

What is the principle of conservation of energy?

Back

The principle states that energy cannot be created or destroyed, only transformed from one form to another.

Front

Identify the energy transfer: chemical to kinetic, solar to electrical, thermal to light, electrical to light.

Back

Electrical to light.

Front

What is the formula for calculating energy?

Back

Energy (J) = Power (W) x Time (s).

Front

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

Back

The width of the arrows represents the quantity of energy or material flow.

Front

What is the significance of Sankey diagrams in energy management?

Back

Sankey diagrams help visualize energy efficiency and identify areas for improvement in energy use.