Usage History of 'watthours'

The following chart shows how frequently 'watthours' appeared in printed materials over time. For example, the word 'watthours' occurred 4 times in books in 1887 and 156 times in 2008. From 1887 to 2008, the word 'watthours' was used a total of 6,470 times in books scanned by Google. See Reference: Google Ngram project.

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