Gareth56 Posted March 11, 2008 Share Posted March 11, 2008 How can I receive a 50kV electric shock (say via a taser) and not get killed? Link to comment Share on other sites More sharing options...
insane_alien Posted March 11, 2008 Share Posted March 11, 2008 because there is very little current involved. voltage doesn't kill, current does. doesn't mean it doesn't hurt though. its not something you want to experience. Link to comment Share on other sites More sharing options...
Gareth56 Posted March 11, 2008 Author Share Posted March 11, 2008 How do get such a high voltage with such a low current? Link to comment Share on other sites More sharing options...
ecoli Posted March 11, 2008 Share Posted March 11, 2008 Ohms law is V = IR ... Voltage is proportional to current times resistance. Apply a high voltage over a large resistor, the current will be small. Link to comment Share on other sites More sharing options...
insane_alien Posted March 11, 2008 Share Posted March 11, 2008 the human body makes quite the resistor. it can also be achieved by rapidly discharging a very small capacitance capacitor which will only store a set amount of energy. this can be repeatedly charged and discharged to disrupt your nervous system. i think this is what happens as it feel like getting kicked in the place it hits really fast by 1000 midgets on speed. Link to comment Share on other sites More sharing options...
Gareth56 Posted March 11, 2008 Author Share Posted March 11, 2008 I recall many years ago seeing a trick cigarette lighter which when you pressed the ignite button you got a shock and that only used a 1.5V battery; so how could that deliver a high voltage then? Link to comment Share on other sites More sharing options...
thedarkshade Posted March 11, 2008 Share Posted March 11, 2008 Ohms law is V = IR ...We write it a bit different:[math]U=IR[/math] .. and by the way Ohms law is [math]R=\frac{U}{I}[/math] and from that you derive what you have written! Link to comment Share on other sites More sharing options...
ecoli Posted March 11, 2008 Share Posted March 11, 2008 We write it a bit different:[math]U=IR[/math] .. and by the way Ohms law is [math]R=\frac{U}{I}[/math] and from that you derive what you have written! SSDD I recall many years ago seeing a trick cigarette lighter which when you pressed the ignite button you got a shock and that only used a 1.5V battery; so how could that deliver a high voltage then? That prank has no where near the 'kick' of a taser. Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 SSDD That prank has no where near the 'kick' of a taser. I know, but how did a small 1.5V AA battery produce such an unpleasant sensation? Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 via a step-up transformer. Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 via a step-up transformer. But this joke thing was only about 1.5" long buy say 0.5" thick. The transformers I've seen are dirty great big hulks of metal and plastic that need to be plugged into the mains. Also I thought that transformers worked only with alternating current. Even though direct current will create a magnetic field in the core [of the transformer] it will however not be a changing magnetic field and so no voltage will be induced in the secondary coil. Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 LOL, there are transformers the size of a Match head out there, the 5Kv Trigger coil in a camera flash unit isn`t much bigger than a pencil eraser. as for AC (or pulsed DC) what`s the problem? a simple astable, or Hartley oscillator will do that Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 LOL, there are transformers the size of a Match head out there, the 5Kv Trigger coil in a camera flash unit isn`t much bigger than a pencil eraser.as for AC (or pulsed DC) what`s the problem? a simple astable, or Hartley oscillator will do that So how do these transformers get over the problem of DC not producing alternating magnetic fields? Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 what part of my post that you quoted don`t you understand exactly? Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 what part of my post that you quoted don`t you understand exactly? You just mentioned various transformers without explaining how they worked . My question was "So how do these transformers get over the problem of DC not producing alternating magnetic fields?" Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 I hate Quoting myself, but here goes... as for AC (or pulsed DC) what`s the problem? a simple astable, or Hartley oscillator will do that That`s how it gets around that "Problem". Link to comment Share on other sites More sharing options...
DrP Posted March 12, 2008 Share Posted March 12, 2008 How can I receive a 50kV electric shock (say via a taser) and not get killed? There is an old saying " Volts for Jolts, mils for kills" meaning high voltage shocks but just a few miliamps can kill. Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 heh, that`s a similar version to the one I learned, "It`s the volts that jolts and the Amps that cramps". Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 I hate Quoting myself, but here goes... That`s how it gets around that "Problem". There's no shame in not knowing how something works but thanks for trying Link to comment Share on other sites More sharing options...
insane_alien Posted March 12, 2008 Share Posted March 12, 2008 if the DC voltage is in a short pulse, it will behave like AC in a transformer. meaning, out the other end of the transformer, you will get a spike of very high voltage which is what causes the spark. Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 There's no shame in not knowing how something works but thanks for trying WTF??? have you even TRIED to understand the answer that I gave you? do you even KNOW what an Oscillator is? there simply IS NO other answer! *Sheesh* Hartley Oscillator: http://en.wikipedia.org/wiki/Hartley_oscillator Astable: http://en.wikipedia.org/wiki/Multivibrator I think you Owe me an apology ! Link to comment Share on other sites More sharing options...
Gareth56 Posted March 12, 2008 Author Share Posted March 12, 2008 WTF??? have you even TRIED to understand the answer that I gave you? do you even KNOW what an Oscillator is? there simply IS NO other answer! *Sheesh* Hartley Oscillator: http://en.wikipedia.org/wiki/Hartley_oscillator Astable: http://en.wikipedia.org/wiki/Multivibrator I think you Owe me an apology ! Hartley Oscillator: http://en.wikipedia.org/wiki/Hartley_oscillator <-------- content means nothing to me I'm not an electrical engineer or an electronics engineer. Astable: http://en.wikipedia.org/wiki/Multivibrator<-------- content means nothing to me I'm not an electrical engineer or an electronics engineer. The response from insane_alien was what I was looking for not vague references to bits of kit followed by web references that are written for people who have a fairly good understanding of the subject of electronics. My question was was "how do these transformers get over the problem of DC not producing alternating magnetic fields?". Just giving references like those above wouldn't earn you many marks in an exam. However as I said thank you for trying. Link to comment Share on other sites More sharing options...
Phi for All Posted March 12, 2008 Share Posted March 12, 2008 Just giving references like those above wouldn't earn you many marks in an exam. However as I said thank you for trying.You implied YT didn't know what he's talking about. Although he may not have explained it to your satisfaction, telling him, "There's no shame in not knowing how something works but thanks for trying" was rude and condescending. *You* are the one who doesn't know how it works, not YT2095. Link to comment Share on other sites More sharing options...
YT2095 Posted March 12, 2008 Share Posted March 12, 2008 I would have thought the word "Oscillator" would have been a dead give-away, taken from the word "Oscillate" meaning that it Changes (unlike DC which remains constant). effectively you employ this Oscillator (and tasers use Hartley and sometimes astables) to effect this "Change" in current and then apply this to the primary winding of a Step-up transformer, this energises the magnetic field, and when the current stops or goes in the other direction the mag field Collapses as the current passes though the Zero PD point, and in doing so creates a Secondary current often called Back EMF (you might want to google "Back EMF"), the Secondary coil picks up this field collapse and presents it at a much higher voltage (it has more coil windings than the Primary). you see this (or feel it) as a shock or spark. Link to comment Share on other sites More sharing options...
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