Thread: why 12V?
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Old March 7th 17, 11:37 PM posted to
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Default why 12V?

On Tue, 7 Mar 2017 22:21:58 -0000, "NY" wrote:

"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.

TTL logic must figure strongly in the answer.