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  #1  
Old 01-18-2009, 03:30 AM
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Default 9V Batteries, Are they harmful?

Well, I was sitting here bored out of my mind because everyone got off MSN and nobody was texting me back, so I was lookin around and found an old 5.25" door speaker, and thought to myself..... "Why not try and blow this up?"

I have heard before that using a 9V battery to "pop" a speaker in your car is bad and shouldn't be done for more than a split second or you can blow them.

So I grabbed a bunch of 9V batteries (8) and wired them up in series. So I'm sitting here with 72V and a 4ohm speaker and turn on my phones camera, and all it does is pop when I hook it up. So I held it for a little, popped it a lot, the copper was actually kind of burning from the voltage (green sparks instead of blue) And after about 2 or 3 minutes I gave up. The coil was just mildly warm and gave off the slightest bit of smell. The batteries would almost burn you to touch them. If you pressed on the cone it still moves freely and makes no noises.

So I have concluded that using a 9V battery to "pop" a speaker in a car to find out which one the wires go to is not deathly harmful for them.

Thought I would share that with everyone.



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  #2  
Old 01-18-2009, 03:41 AM
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72V yes but very, very low amperage. V*A/Ohms = W. It's called Ohm's law and determines the actual working wattage. If you wired a bunch of sub C batteries together and did the same thing you'd burn the speaker up in a hurry. Sub C's have enough amperage to jump start a car. I've seen it done first hand.
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Old 01-18-2009, 04:08 AM
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Yeah, It was mainly just to show that the people who say that a regular old 9V battery will blow a speaker are wrong.

Do you happen to know the amperage of a regular old 9V battery? That way we could figure up how many watts were going to it. I just looked and it doesn't say the amps on it.



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Old 01-18-2009, 04:13 AM
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I'd have to have one to hook to a speaker. I've got a Fluke 336 clamp ammeter I could get a true reading with. Offhand I'd venture to guess it's less than 1 amp sustained, most likely 1/2 amp.
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Old 01-18-2009, 04:15 AM
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So say it was 1amp, then I was giving it a whopping 18W.

Lol.



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Old 01-18-2009, 04:16 AM
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Yeah, that's about it.
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Old 01-18-2009, 05:17 AM
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wait... V*V=Watts = not true?

'
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Old 01-18-2009, 05:28 AM
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Quote:
Originally Posted by matt6387 View Post
wait... V*V=Watts = not true?
Where did you hear that?



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Old 01-18-2009, 05:53 AM
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this post?

or do you mean voltage squared?
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Old 01-18-2009, 06:10 AM
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It's volts x amps / ohms = watts



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