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    JoeMcMuffin's Avatar
    JoeMcMuffin Posts: 1, Reputation: 1
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    #1

    May 28, 2013, 07:40 PM
    Battery Power
    So, I have an amplifier that runs off 12v 2amps DC, and I'd like to run it off 3 9-volt batteries. I'm not sure if I'll get enough power out of them by using a 7.5 ohm resistor, or if I'm doing my math wrong, or if it would even last long enough from the batteries. Help please.
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #2

    May 29, 2013, 04:12 AM
    Why the resister? And why 7.5 Ohm? Why do you need this?
    Why not connect the (3) batteries and see how long it runs? The 12V, 2 amps you mention sounds like the rating of the amp, not necessarily the average power draw.
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