How does one determine how much power a car amplifier will draw from a battery, what should one look for while reading the specifications of the amp?
by 
Oracle9007
ANSWERS: 3
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I think I know this one. P=W/t, or VI, and V=IR, so P=IIR. If you know the resistance of the amplifier, and the current, then yopu can work out the power. Alternatively, from the first equation, if you know the wattage then you can calculate in kilowatt/hours.
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P is power W is wattage t is time V is voltage I is current R is resistance. so, e.g., iir is current squared times resistance.
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I am an industrial electrician. The most basic formula is P=EI. Power(watts or "P") equals volts(electrons or "E") times amps (current or "I"). Therefore a 500 watt amplifier would draw about 36.23 amps based on a 13.8 volt charging system when the car and alternator are running. 500=13.8xI. 500 / 13.8 = 36.23. When the vehicle system is not charging the battery voltage will decrease, in turn raising the amperage.
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