How does an Electric Line Tester work?
Electric line tester, when we keep the pointed end of the tester in contact with the wire through which electric current is passing and touch the metal cap at the other end, a small amount of current passes through the neon bulb, high resistance in the tester and through our body to the earth (which is at zero potential). Here the body completes the electric circuit which makes the neon bulb to glow. If the bulb glows, it means the current is passing through the wire and the device under test is functioning otherwise, the current is not passing through the device or line under test is faulty. High resistance in the tester allows only small amount of current passes through our body.
Lakshmi Emani
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