Testers which are used for testing voltage at some plug (more like a screw driver with leon lamp & external metal tail), when you insert it in a plug & touch external metal point LED glows giving indication about voltage present. If you don't touch metal it won't glow even if it is in plug having voltage.
- I want to know how lamp glow when I touch the metal.How does the circuit gets completed. Even if sit on plastic or wooden chair, it still works same way?
- Some people say, current gets on your body for 8ms (0.5/60 Hz) & next 8ms it gets off. Then how does it works in dc.
- Some say body is capacitor which stores charge. Then even if there is no return path for current, i.e I am standing on wooden chair. then how would it store charge. Further comment is capacitor is like a break in wire. It store charge anyways. But I tested by connected +ve leg of capacitor to +ve of dc supply only & left open -ve leg of cap. It don't get charged. That means cap neads return path to be charged.
I tested current when put in 220V ac by connecting FLUKE ammeter between & current comes 17 to 18 uA ac.
But then I connected it to 100Vdc. Although light was dim, my ammeter showed 0 uA dc. might be due to precision problem in meter.
