Sankey diagrams

你需要知道的

• In a Sankey diagram the width of each arrow shows how much energy it represents.
• Useful energy carries straight on, while wasted energy (usually by heating) branches downwards.
• The arrows leaving add up to the arrow going in, which shows energy is conserved.
• Efficiency is useful energy output divided by total energy input, so a value nearer 1 means a better device.
• A worked television example reads values off a grid and gives an efficiency of 0.8, compared with 0.2 for a filament bulb.

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