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Voltage, Amperage, etc...

K

KevC

Supreme [H]ardness
Joined
Oct 21, 2001
Messages
6,365
Hey,
I understand that you can run a fan at 12V, 7V, or 5V. Now I didn't do any electrodynamics and first year, and I totally forgot all electro in highschool, so please clarify some stuff for me. V is Volts which is a measure of Voltage, correct? This is basically the difference in potential, yeah?
How about Amperage? This is measured in Amps? This is current? How fast the electrons are flowing?
I have a device that requires a 9V battery. Usually a fully charged alkaline battery is 9.4V. It drops down to about 4V and then the battery is dead, correct? Anyone have any idea how amperage works? How many amps does a battery have?
Would it be possible to somehow power this device using a computer power supply? I have a TruPower 380W. Now looking at Antec's site... it says the 12V line is max 24A, min 0.8A. That's also shared between my harddrive, my dvdrw, and maybe even my cpu, correct? Do I have any idea how many amps go through? Would too many amps kill my device? The ripple is 120mV, that sounds huge.

My device is a headphone amp...
 
I wouldn't run a headphone amp off a computer power supply... 120mV is huge, and that ripple will mix/intermodulate with whatever audio you're listening to, and it won't sound good. You'll probably also hear ticks/hisses/etc that go along with hard drive accesses and other things.

Use a separate wall wart.
 
KevC said:
V is Volts which is a measure of Voltage, correct? This is basically the difference in potential, yeah?
How about Amperage? This is measured in Amps? This is current? How fast the electrons are flowing?
I have a device that requires a 9V battery. Usually a fully charged alkaline battery is 9.4V. It drops down to about 4V and then the battery is dead, correct? Anyone have any idea how amperage works? How many amps does a battery have?
Click to expand...

1. Yes
Volts are a measure of electric potential. Voltage is often explained using a liquid analogy -- comparing water pressure to voltage: a high pressure hose would be considered high voltage, while a slow-moving stream could be compared to low voltage.

2. Yes
A measurement of the flow of electrical current. One amp is equal to the electric force of one volt acting across the resistance of one ohm.

3.
http://www.repairfaq.org/ELE/F_Battery_info.html
A typical "AA" size 1.5 volt alkaline cell has a capacity of about 500 mAH. This is a rough approximation of usable service life (at least for this discussion) for average load conditions. For instance, one should be able to expect a usable service life of about 100 hours for a load that draws 5 mA from the battery.

My battery catalog doesn't list the capacity for 9 volt batteries, but given the physical size, one can probably estimate a capacity of around 100-200 mAH.
Click to expand...

http://www1.electusdistribution.com.au/images_uploaded/recharge.pdf

and as our resident Electrical Engineer has pointed out the Noise form any reasonably pricd PSU would be less than ideal ;)
 
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