How exactly the electric line tester works.

What here I am going to write is very basic but interesting.

Every common man (who uses electricity) knows what is the Tester & how to use it.

But most of the people don’t know how exactly it works?

When we touch mouth (flat end of the Metallic rod) of Phase or Line tester with naked Live / hot wire whereas one of our finger touch the metallic Cap Screw or Clip of Phase/Line Tester  then circuit is completed and current start to flow in Metallic rod.

Metallic rod is connected to the resistor which reduces high current to a safe value. The reduced Current passes through Neon bulb which is connected to (metallic spring) . Metallic spring is connected with metallic Cap screw which is in contact of our fingers. A very small current passes through our body to earth and complete the circuit. When circuit is completed, current starts to flow and the filament of neon bulb starts glowing. One thing which is important here is that the neon lamp takes very little current to light, and thus can use the user's body impedence to earth ground to complete the circuit.This indicates that the touched wire with Phase/Line Tester mouth is Phase/Line/Hot.

If we perform the same action as mentioned above, and Neon bulb does not glow, it means that is a Neutral Wire/Conductor and Neon bulb does not glow, it means that  it is a neutral wire/ conductor.

These types of currents, which does not cause any harm to our body are called as “let go currents”. (For women, it is typically 5 to 7 milliamperes, and for men, typically 7 to 9 milliamperes. This is dependent on the muscle mass of the individual.)

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Try doing this:

1.     Stand on plastic/wooden chair.

2.     Insert tester in socket, with one of your fingers touching end of tester.

3.     Switch ON the supply.

If you follow above steps you will find, light inside tester illuminates but intensity is quite low. Because additional resistance gets added in circuit.

That’s all!

#AAYUSH BHARDWAJ