page_title: Emergy
section_title: Systems diagram
hierarchical_section_title: Emergy / Accounting method / Systems diagram
caption_attribution_description: English: This image was created by Mark T. Brown. Mtbrown8 (talk) 09:54, 6 June 2010 (UTC)
context_page_description: Emergy is the amount of energy that was consumed in direct and indirect transformations to make a product or service. Emergy is a measure of quality differences between different forms of energy. Emergy is an expression of all the energy used in the work processes that generate a product or service in units of one type of energy. Emergy is measured in units of emjoules, a unit referring to the available energy consumed in transformations. Emergy accounts for different forms of energy and resources Each form is generated by transformation processes in nature and each has a different ability to support work in natural and in human systems. The recognition of these quality differences is a key concept.
context_section_description: System diagrams show the inputs that are evaluated and summed to obtain the emergy of a flow. A diagram of a city and its regional support area is shown in Figure 1.
caption: Figure 1: Energy system diagram of a city in its support region
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