Sankey Diagrams

• What do Franky diagrams show in machines?

  Energy transfers that take place
• What does a thicker arrow in a Franky diagram indicate?

  Greater amount of energy involved
• What do horizontal arrows in a Franky diagram represent?

  Energy transferred usefully
• What does the downward arrow in a Franky diagram indicate?

  Amount of energy that is wasted
• What types of energy does a television transfer?

  Light and sound
• How can energy transfers be shown in units?

  Using power in joules per second
• What is the energy output of a hair dryer?

  Kinetic, useful heat, and useful sound
• What does the law of conservation of energy state?

  Energy cannot be created or destroyed
• How can the efficiency of a device be calculated?

  Useful energy out divided by total energy in
• What is the formula to convert efficiency to a percentage?

  Multiply by 100
• What is the significance of using a scale in Franky diagrams?

  To work out the amount of energy
• What is the purpose of a Franky diagram?

  To illustrate energy transfers in machines