What is the advantage of using LED in testing the electrical conductivity of liquids?

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Solution

When electric current flows through a bulb then due to heating effect of current, the filament of the bulb gets heated up to a high temperature and it starts glowing.
Now for a liquids having low electrical conductivity, the current flowing through the circuit is very weak due to which the filament does not get heated sufficiently and hence the bulb does not glow. Therefore, LED is used in place of bulb because LED glows even when weak electric current flows in the circuit.

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