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Need help with battery / voltmeter / ammeter (any smart dudes out there?)

post #1 of 16
8/21/09 at 7:29pm
Thread Starter 
Yalls, I have a 6 volt battery. I need it to gimme some amps. Milliamps to be exact. I hooked it up to my multimeter (voltmeter setting). It reads 6.4 volts. I then turned it to the amp setting. It reads 0 amps!! WTF. Isn't a 6 volt battery supposed to have 6 amps or something? Or 6 mA? Or something!??! Why is this thing giving me no ampage? Hlep!
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post #2 of 16
8/21/09 at 7:35pm
Check your connections. Should look like so
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post #3 of 16
8/21/09 at 7:37pm
You'll have to setup a circuit for the battery to measure it, otherwise you're just measuring the resistance through the multimeter (which will be zero).

That, or you've blown the fuse in it.
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post #4 of 16
8/21/09 at 7:56pm
Thread Starter 
Quote:
Originally Posted by robin View Post
You'll have to setup a circuit for the battery to measure it, otherwise you're just measuring the resistance through the multimeter (which will be zero).

That, or you've blown the fuse in it.

It's not the fuse because I have three newish batteries all showing the same reading.

What does "setting up a circuit" mean?
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post #5 of 16
8/21/09 at 8:03pm
isnt amps a measurement of current? so you have no current as there is no circuit? im not sure.
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post #6 of 16
8/21/09 at 8:11pm
Thread Starter 
Quote:
Originally Posted by sho'nuff View Post
isnt amps a measurement of current? so you have no current as there is no circuit? im not sure.

How would you create a circuit using three batteries and a bunch of wires that I can connect them with.
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post #7 of 16
8/21/09 at 8:16pm
WTF are you doing? Building a time machine?
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post #8 of 16
8/21/09 at 8:18pm
Thread Starter 
Also, isn't there already a circuit? One wire going from the battery to the multimeter, through the meter, and back through the battery using another wire.

Quote:
Originally Posted by Bhowie View Post
WTF are you doing? Building a time machine?

Top secret.
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post #9 of 16
8/21/09 at 8:20pm
not sure how you create a circuit with three batteries, but for a simple circuit, all you need is a voltage source (battery) , resistance (light bulb, resistor, etc), and from that you can measure the current (amp) depending on your battery and resistance.

all i remember is V=I*R
voltage = Current * resistance
or
current (amp) = voltage /resistance



the multimeter is to measure the current or voltage of in a circuit with a certain resistance in it. not just a battery with wires going around with no resistor in your case ( the guy above said multimeter has no resistance)


correct me if im wrong.
(this is the only thing i remember from physics involving electricity hehee)
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post #10 of 16
8/21/09 at 8:24pm
what size is the battery. The size will tell you how many milliamp hour it can deliver, then of course worded better than I would"

"Why is Battery Capacity Specified in Ampere-Hour?

An ampere is a unit for measurement for the amount of electricity current flowing through a circuit. One ampere is the same as one coulomb of electric charge flowing past any point per second. It is also the same as current produced by one volt of electricity applied across a 1-ohm resistance.

One ampere-hour is equal to a current of one ampere flowing for one hour. So, if you have a two ampere-hour battery, then it has the capacity to flow a two-ampere current for one hour. Or you can use the same battery to flow a one-ampere current for two hours. Therefore, a larger Ah always specifies higher capacity. "

you have the voltage, current capacity plug it into your time machine and bob's your uncle.
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post #11 of 16
8/21/09 at 8:29pm
Thread Starter 
Jesus. This can't be that hard. I am pretty sure you should be able to measure amps without using a resistor or having to try to understand Agnacious' post.
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post #12 of 16
8/21/09 at 8:33pm
dont know how to help. maybe someone smart can chime in .
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post #13 of 16
8/21/09 at 8:33pm
Thread Starter 
Solved. There are three holes in the multimeter due to the number of readings it can perform. I had to use a different combination of the two to get the amp reading than the volt reading. No, it is not labelled.

I'm going back in time, bitches!

BTW, the 6V batteries did end up giving me about 5.5mA each.
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post #14 of 16
8/21/09 at 8:43pm
Quote:
Originally Posted by MetroStyles View Post
Solved. There are three holes in the multimeter due to the number of readings it can perform. I had to use a different combination of the two to get the amp reading than the volt reading. No, it is not labelled.

I'm going back in time, bitches!

BTW, the 6V batteries did end up giving me about 5.5mA each.

Please tell me what gave me the squirts 5 months ago, kthnx bai.
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post #15 of 16
8/21/09 at 8:52pm
Quote:
Originally Posted by MetroStyles View Post
Solved. There are three holes in the multimeter due to the number of readings it can perform. I had to use a different combination of the two to get the amp reading than the volt reading. No, it is not labelled. I'm going back in time, bitches! BTW, the 6V batteries did end up giving me about 5.5mA each.
Think of current as water through a hose. If you attach a large diameter hose you get high flow, small diameter hose, low flow. You attached the internal resistance of the meter and got a certain current based on that resistance. This is why current is not directly stated as such but as in amp-hours because it can vary depending on the load. But this is all immaterial to the fact that I recommend the TARDIS design:
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