Thread: why 12V?
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Old March 7th 17, 10:21 PM posted to
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Default why 12V?

"Bill Wright" wrote in message
So many things run on 12V DC. Firstly, why has that become the standard?
Is it all because of the nominal voltage of a car battery?

I would imagine so. 12V can easily be made out of six 2V lead-acid cells
(for a car) or eight 1.5V batteries (for a portable radio etc).

I'm not sure how 5V became the standard for USB power.