Energy Transfers Comparing energy to money I need

Energy Transfers Comparing energy to money! I need some change for the vending machines. 10 Pound Note 8 x £ 1 Coins Useful for the vending machine! 1 x £ 2 Coin Doesn’t fit in the machine!

Energy Transfers 10 Pound Note Input 1 x £ 2 Coin Useful Wasted There is still 10 pounds available, but it now appears differently.

Sankey Diagrams

Sankey Diagrams

Sankey Diagrams The height of the box represents the amount of energy that is put in.

Sankey Diagrams The height of the next box represents the amount of useful energy.

Sankey Diagrams But we rotate it to show that it is wasted energy. The height of the final box represents the amount of wasted energy.

Sankey Diagrams Useful Output Energy Input Energy Finally we add arrows to our boxes and label the diagram. Wasted Output Energy

Sankey Diagrams 8 x £ 1 Coins £ 10 Note 1 x £ 2 Coin

Energy Transfers Now for an example, an energy efficient light bulb. Electrical Energy 10 Joules Input Light Energy 8 Joules Heat Energy 2 Joules Useful Wasted There is still 10 joules of energy available, but it now appears differently.

What about energy? Light Energy 8 joules Electrical Energy 10 joules An energy efficient light bulb with an input energy of 10 joules, useful output of 8 joules and a wasted output of 2 joules. Heat Energy 2 joules

What makes a good sankey? Arrows are labeled with input and output energies. Electrical Energy 10 joules Boxes are the correct width. Straight lines, drawn with a ruler. The wasted energy is labeled. Light Energy 8 joules Heat Energy 2 joules

What is wrong? 1: 00 1: 01 1: 02 1: 03 1: 04 1: 05 1: 06 1: 07 1: 08 1: 09 1: 10 1: 11 1: 12 1: 13 1: 14 1: 15 1: 16 1: 17 1: 18 1: 19 1: 20 1: 21 1: 22 1: 23 1: 24 1: 25 1: 26 1: 27 1: 28 1: 29 1: 30 0: 01 0: 02 0: 03 0: 04 0: 05 0: 06 0: 07 0: 08 0: 09 0: 10 0: 11 0: 12 0: 13 0: 14 0: 15 0: 16 0: 17 0: 18 0: 19 0: 20 0: 21 0: 22 0: 23 0: 24 0: 25 0: 26 0: 27 0: 28 0: 29 0: 30 0: 31 0: 32 0: 33 0: 34 0: 35 0: 36 0: 37 0: 38 0: 39 0: 40 0: 41 0: 42 0: 43 0: 44 0: 45 0: 46 0: 47 0: 48 0: 49 0: 50 0: 51 0: 52 0: 53 0: 54 0: 55 0: 56 0: 57 0: 58 0: 59 End

Arrows are labeled with input and output energies. Boxes are the correct width. Straight lines, drawn with a ruler. The wasted energy is labeled.