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The CURRENT is actually AC coming Directly from the Alternator. A voltage regulator/converter then takes it to DC. For all practical purposes, a typical automobile operates on 12Vdc. The Alternator actutally puts out about 14 Volts to allow for constant charging of the battery.

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13y ago
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11y ago

dc - the voltage is a constant 12 volts nominally in a normal car battery.

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14y ago

The word 'alternator' means 'producer of alternating current'.

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Q: Is a car 12 volt battery ac or dc?
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