Vehicle electrification
Encyclopedia
Vehicle electrification is a topic that covers many aspects of electrification
Electrification
Electrification originally referred to the build out of the electrical generating and distribution systems which occurred in the United States, England and other countries from the mid 1880's until around 1940 and is in progress in developing countries. This also included the change over from line...

 in vehicles. It may cover vehicles with electrical means of propulsion, as well as electricity playing a role in their functionality. Voltages vary widely between applications.

5 volt

5 volt systems are typically just a secondary voltage system on USB ports that come with newer automobiles as they complement the traditional cigar lighter receptacle
Cigar lighter receptacle
The cigarette lighter receptacle in an automobile, initially designed to power an electrically heated lighter, became a de-facto standard DC connector to supply electrical power for portable accessories used in or near an automobile...

 as they both have their roles in charging mobile devices.

6 volt

Automobiles engineered prior to the 1940s had 6-volt systems in them. However, 6-volts is a common voltage for single 3-cell deep cycle lead-acid batteries for applications such as golf carts, though they have 24 volts or 36 volts for their electric motors.

12 volt

12 volt systems are by far the most common voltage system for vehicles in general. Primarily the voltage was devised to overcome limitations of old 6-volt systems as, by the 1950s starting motors needed to become more powerful, but needed more power with less current as well as a way to cut down on wire gauge
Wire gauge
Wire gauge is a measurement of how large a wire is, either in diameter or cross sectional area. This determines the amount of electric current a wire can safely carry, as well as its electrical resistance and weight per unit of length...

 as more equipment came along and put a greater load on the system. Over time, 12 volt systems evolved to have mainstream niche fields like car audio
Car audio
Car audio/video , auto radio, mobile audio, 12-volt and other terms are used to describe the sound or video system fitted in an automobile. While 12-volt audio and video systems are also used, marketed, or manufactured for marine, aviation, and buses, this article focuses on cars as the most common...

 which has spanned across

24 volt

24 volt systems are common in military and commercial truck applications. It is also a secondary voltage system for switched-mode power supplies with parallel-to-series relays for facilitating engine starting on diesel engine
Diesel engine
A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

s as they require more compression than regular gas.
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