Get shock from a standard transformer?
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Posted by on February 10, 2006, 10:43 am
Please log in for more thread options Hello. I see on many transformers (of home application like chargers, scanners etc.) that they're capable of delivering upto 1000ma, or even 1500ma. As I know, an amount of over 0.24ampre can kill someone. So how come when I touch both ends of the output (which is about 12v) nothing happens, I dont get any feeling at all, let alone get zapped to the next life? | ||||||||||||||||||||||||||||||||||
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Posted by Pooh Bear on February 10, 2006, 11:14 am
Please log in for more thread options arthurdent44@gmail.com wrote: Less than that in fact. >
> So how come when I touch both ends of the output (which is about 12v) > nothing happens, I dont get any feeling at all, let alone get zapped to > the next life? The voltage is to low to do any harm. You're probably drawing microamps. Graham | ||||||||||||||||||||||||||||||||||
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Posted by on February 10, 2006, 11:29 am
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> The voltage is to low to do any harm. You're probably drawing microamps.
Can you explain this to me? Because I know that its the current which counts, like, for instance in those transparent balls that when you touch them you draw a small lightning - they contain something like thousands of volts, right? and they don't electrify you. Also, where I work they use 24vDC rt amplifiers that go up to 1000w, so they use 20-30A, and they _can_ shock you, despite the relatively low 24v, right? so how does it work? | ||||||||||||||||||||||||||||||||||
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Posted by James T. White on February 10, 2006, 11:55 am
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>> The voltage is to low to do any harm. You're probably drawing
>> microamps. >
> Can you explain this to me? > Because I know that its the current which counts, like, for instance > in those transparent balls that when you touch them you draw a small > lightning - they contain something like thousands of volts, right? and > they don't electrify you. > Also, where I work they use 24vDC rt amplifiers that go up to 1000w, > so they use 20-30A, and they _can_ shock you, despite the relatively > low 24v, right? > so how does it work? Your 12v transformer can deliver up to 1000ma into a load. If you hook a 12 ohm resistor across the transformer output, the voltage across the resistor would be 12v and 1000ma would be flowing through it. Luckily for you, your skin resistance is much, much higher than 12 ohms so if you touch the terminals only a tiny fraction of 1000ma flows through your body. As others have suggested, you can increase the current flow by wetting your hands with water or salt water to reduce your skin resistance. If you are unlucky enough to break the skin with the terminals, you would present an even lower resistance. -- James T. White | ||||||||||||||||||||||||||||||||||
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Posted by Bob Masta on February 11, 2006, 8:52 am
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On 10 Feb 2006 08:29:11 -0800, arthurdent44@gmail.com wrote: >> The voltage is to low to do any harm. You're probably drawing microamps.
>
>Can you explain this to me? >Because I know that its the current which counts, like, for instance in >those transparent balls that when you touch them you draw a small >lightning - they contain something like thousands of volts, right? and >they don't electrify you. >Also, where I work they use 24vDC rt amplifiers that go up to 1000w, so >they use 20-30A, and they _can_ shock you, despite the relatively low >24v, right? >so how does it work? > In addition to what others have posted, note that at RF frequencies there may be a greater ability to punch through the dead skin cells at the surface which are causing the skin resistance to be so high. So don't mess around with this! Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com Home of DaqGen, the FREEWARE signal generator | ||||||||||||||||||||||||||||||||||
> I see on many transformers (of home application like chargers, scanners
> etc.) that they're capable of delivering upto 1000ma, or even 1500ma.
> As I know, an amount of over 0.24ampre can kill someone.