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post #1 of 2 Old 11-28-2012, 02:30 AM - Thread Starter
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Dear everyone,

I'm writing on behalf of my somewhat fuzzy knowledge of electronics and the need to gain clearity for a specific project.

I'm aiming to assemble one of those mobil sound systems. I need a car-battery power a set of active speakers with a laptop as an audio source.

So first question: How can I read how much power (in Watt, or in volts and amps) a set of active speaker draw? What parts of the technical specifications tell you the power consumption of a set of speakers.

Second: If one plugs (with a proper fuse of course) a car battery, say rated for 12v 60 Ah to a set of active speakers, will the battery then "automatically" adjust its amps out to the power-consumption of the speakers? Meaning that a speakers with higher wattage will just shorten the "play-time" / "life-time" of the battery?

I'm attempting to get this together within two weeks in Addis Ababa (Ethiopia) so the availability of equipment is somewhat crud. Essentially it just needs to work, hi-fi and finesse is not (this time) of great importance.

Thanks in advance!
Simen
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post #2 of 2 Old 11-28-2012, 10:28 AM
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Think of the battery as a resovior. A 60ah battery can handle that or less. If you plug in a device that requires 1ah it will draw 1ah from the resovior. This means you still have room to plug in other devices to the battery. The more amps used the faster the battery will deplete. You do need to use 12v devices though. A device rated at 6v or 24v for example probably will not work right in a 12 battery application.

Someone once explained it this way,

voltage is the size of the river, how wide the river is.
current (or amps) is the speed the water is traveling.....
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