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Old 06-12-2012, 05:03 PM   #1
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Simple question on transformers from a n00b

Hello every one, I'm new to the forum and electrisity in general. Here is my first post; Its a simple question hopefully not to simple though. I have a power supply of 20kilo-volts at 0.5 amp. I wanted to know if a transformer could step the voltage down to 120 and raise the amperage to 50amps or ballpark range of? Thanx in advance


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Old 06-12-2012, 05:11 PM   #2
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20,000 v x 0.5A = 10 kW. This thing is lethal.

120v x 50A = 6 kW.

6<10, so, yes, at least in principle.


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Old 06-12-2012, 05:20 PM   #3
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AWSOME! Thank you so much.
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Old 06-12-2012, 08:27 PM   #4
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Only if the power supply is AC, or pulsed DC.

If it is just plain ol' DC, it'll burn up the transformer.

P.S. As noted, 20 KV at 0.5 amps is absolutely lethal!! It will kill you instantly if you're not extremely careful. A typical overhead power line in a residential neighborhood will have a minimum or 2.4 KV to ground, usually more like 7.2 KV. And we all know what happens if you get hit with one of those......

This isn't the 20 KV you find in an ignition coil or even an electric fence. Those items produce low enough current that the resistance in your body will cause the voltage to drop to a non-lethal level.

Be careful around this power supply.


Last edited by micromind; 06-12-2012 at 08:50 PM. Reason: Added P.S.
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Old 06-13-2012, 12:49 AM   #5
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Sounds like a homework problem, rather than reality. A 20kV 500mA supply is a heck of a power source. Nobody has that sitting around unless they really know what they're doing.
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