Usage History of 'watthour'

The following chart shows how frequently 'watthour' appeared in printed materials over time. For example, the word 'watthour' occurred 4 times in books in 1893 and 470 times in 2008. From 1893 to 2008, the word 'watthour' was used a total of 27,484 times in books scanned by Google. See Reference: Google Ngram project.

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