High Frequency Electricity Demonstrating the "Skin Effect"

I've stepped down the 120VAC 60Hz to 12VAC @20Khz, then stepped the voltage back up to 120VAC but at 20Khz. This Shows how this can power a light bulb, but because of the "skin effect" of high frequency electricity you don't receive a shock.

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Category:

Entertainment

Tags:

• science
• trick
• electic
• electricity
• high
• voltage
• frequency
• skin
• effect
• cool

[GraffixWB]

put the bulb under water and see if it still works

[Gmc42082]

@GraffixWB the skin effect or the bulb. the bulb would stay light for a little bit,but it most likely this is not at a high enough frequency for the skin effect to protect me. when i get time I'll build a frequency generator so i can demonstrate the effect better.

[eck0aleng]

Skin effect at 20kHz is minimal. The only reason it doesn't hurt as much is because the transformers are acting as current limiters. (see magnetic saturation)

[Gmc42082]

@eck0aleng in this case they are not, the transformer is actually a ferrite toroid transformer, they don't become saturated at theses frequencies like an iron core transformer would. the final output is at least 60 watts or .5 amps (as in my demo and defiantly enough to kill) and could reach at least 150 watts, the max output of the electronic transformer

[eck0aleng]

@Gmc42082 Look buddy, I was (and still am) so confident in my explanation that when I wrote "(see magnetic saturation)", I didn't even google it myself because I knew what the top results would be. You obviously didn't do any research (even with my reference) because you tried to relate magnetic saturation to frequency in your retort (btw google top result is a wiki with a good explanation). There are 3 other things you state wrong above, but one is true - it IS enough to kill. Out of space...

[Gmc42082]

@eck0aleng buddy i have a degree in electronic engineering, i don't get my info from wiki, the idiots encyclopedia, i get it from my college text books. yes the effect works better at higher frequencies, as you hear me say, i can feel a tingle, its the current heating up the surface of my skin. the skin effect is just a phenomenon where electrons flow at the surface of the conductor rather than the entire cross section. maybe i'll make a new vid and update a few things.

[ufaxx]

A very good demo!

[chrischris349]

Awesome

[paulma8]

On the other hand if you increase the contact surface, the resistance would go down and the current would go up, even to a level that would kill.

[paulma8]

i read that skin effect at 20kh is minimal and that the reason you don't feel the pain is because the human nervous system doesn't sense electric currents at and above that frequency.

If the human body resistance is about 100 000, 125v would pass a current of 1 ma through you, totally harmless.

For the current to be hazardous it would have to be 150ma at 60hz.

[LeJimster]

How does this compare to the frequencies Tesla used in his "lightning" machine. The same principle applies right? Higher frequency electricity "crawls" over your skin but doesn't penetrate it like low frequency.

[Lipdorn]

I'd probably venture that is more a combination of skin resistance and impedance than the skin effect. The resistance limits the current, and impedance at high frequencies means that it will literally take the shortest distance between the two wires. Thus moving in his skin.

Due to the low conductivity of skin and low frequency of his setup, it cannot be the skin effect. He's illustrating that electricity follows the path of least IMPEDANCE, ie in this case his skin.

[detibry]

so the wires resistance increases with frequency due to the skin effect, which (plus the resistance of you body) brings the current down to a non-lethal level.

is this correct?