While doing experiment on designing & fabricating temparature controller circuit using a thermistor, this strange thing happened.Me & my friend frequently experienced short pulses of electric shock frequently while touching almost any random items for almost an hour while doing experiment. The experiment consisted of: A thermistor immersed in a beaker full of water and connected to + & ground of a power source.A spiralled iron coil connected to power & immersed in water.This coil is powered throughout the experiment to heat the water.We both cleared the hot water after completing sets of experiment & got skin contact with that water. So, why did we get electric shocks?
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2$\begingroup$ Not really enough information here to say for sure - but I would say you had a very dangerous setup and could have got much more hurt than you did. I believe your water heater lacked proper insulation / isolation. Please, before you do this again, have someone with electrical knowledge check your setup very carefully. You could have got very hurt. $\endgroup$– FlorisCommented Feb 6, 2016 at 19:04
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2$\begingroup$ Sounds like faulty electrical isolation to me... for what it's worth (assuming that you value your life and that of others), install a ground fault interruptor and establish proper grounding. Measure the current trough the leakage path (without putting yourself into the loop!) and replace all parts in your circuit that show significant leakage immediately. It is good laboratory practice to add isolation transformers to all such setups. $\endgroup$– CuriousOneCommented Feb 6, 2016 at 19:04
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$\begingroup$ @CuriousOne - insulation and isolation. We wrote the same thing four seconds apart... $\endgroup$– FlorisCommented Feb 6, 2016 at 19:04
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$\begingroup$ @Floris: Potato-potato. I think we can agree on good lab practices... an electric shock sensation plus water is a timeout unless someone wants to turn it into a biology experiment. $\endgroup$– CuriousOneCommented Feb 6, 2016 at 19:09
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$\begingroup$ Please consider these: We did not touch any circuit parts when the power was on and we got shock sometimes even when we touched some other person.Under these circumstances as per your comments it was due to faulty ground/isolation of lab instruments.Am I right? $\endgroup$– user106360Commented Feb 6, 2016 at 19:21
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