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First appearing in the early 1900s, [2] many filling stations offered vehicle repair services as part of their full service operation. This once popular trend has declined significantly over the years as many locations found it more profitable to exchange vehicle service bays for grocery isles, which ultimately led to the emergence of the quick oil change industry.
Apprenticeship, in addition to training once hired; some mechanics may take vocational or community college courses in certain areas such as heating and air conditioning, engine and transmission maintenance, and collision repair; further education and training could lead to becoming a supervisor or manager, or with a baccalaureate or graduate degree, an automotive engineer or design specialist.
High-efficiency all-electric refrigerant compressors for air conditioning are starting to be used, especially in hybrid or all-electric vehicles. The cigarette lighter receptacle serves as a de facto standard for use of portable 12 volt equipment in or near an automobile, it is sometimes used with car charger to power devices with batteries.
A 48 V system can provide more power, improve energy recuperation, [7] and allow up to an 85% decrease in cable mass. [10]12-volt systems can provide only 3.5 kilowatts, while a 48 V power could achieve 15 to 20 kW or even 50 kW. 48 volts is below the level that is considered safe in dry conditions without special protective measures. [11]
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