Answers: zero.the radio is a addressee for am / FM radio frequency's most
are also CD/mp3/players. The after market radios enjoy small amps built - in to the rear legs of the unit. Wattage vary depending on the brand, usually 25w per ch. A stock head component produces about 12w total. Many cars today enjoy very nice stock amplified unit. The amps are located under sitting room, side walls of floor board or in the reverse of the vehicle. The purpose of a amp is to power speakers
That depends on how many speakers you own and how high the volume is. It vary the speakers use all the amperage not the radio itself
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