# energy efficiency

> ratio between the useful energy output and the input of a machine

**Wikidata**: [Q192704](https://www.wikidata.org/wiki/Q192704)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Energy_conversion_efficiency)  
**Source**: https://4ort.xyz/entity/energy-efficiency


## References

1. Integrated Authority File
2. Freebase Data Dumps. 2013
3. YSO-Wikidata mapping project
4. BabelNet
5. Quora
6. National Library of Israel
7. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)