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How the electrical tester light works?
We know that any single phase device, needs a voltage difference between its terminals to be ON.
But with the tester, it is connected to the line from one side, and from the other side my finger, and even I wore an insulated shoes, the lamp light up.
It looks like the circuit was broken by the insulated shoes.
And if the circuit completed, why I didn’t get chocked by electricity.
To start, we need to know what is inside the tester,
Inside the tester you will find the neon lamp, connected with a very high ohm resistance.
Now we see the light is ON.
Let we draw the circuit.
The AC source.
The high ohm resistance.
The lamp.
Your body will be presented as a resistance.
The insolated shoes as a dielectric material, between two conductors.
Then the ground,
So the circuit is completed, and because of that the lamp will light up each time used on a live wire or outlet.
The internal high ohm resistance of the tester, limiting the current passing through the lamp and your body too.
In our circuit, all are connected in series.
That will make the voltage to be divided and will limit the current.
So with that limited current, you won’t be chocked, nor even feel the current passing through your body.
#troubleshooting #Maintenance #Electrical #electricity #engineering
