In fact, the first cars didnt even include electrical systems of any kind.
When automotive electrical systems finally did arrive, they used DC generators.
These generators, unlike modern alternators, didnt require any voltage input to operate.
Tom Blaha / Creative Commons / CC BY-SA 3.0
The receptacle is connected to power and ground, and the plug contains a coiled, bi-metallic strip.
However, it also means that this pop in of plug may lose electrical contact from time to time.
Another issue with using an automotive 12V socket is related to the way that automotive electrical systems work.
Tom Blaha / Creative Commons / CC BY-SA 3.0
With that in mind, all automotive electrical accessories have to be capable of running on roughly 9-14V DC.
Could the Car Cigarette Lighter Be Replaced?
USB may prove anacceptable replacementbecause so many portable devices use USB for data and power.
