Why are LEDs, used in place of bulbs in a circuit to test the conductivity of liquids?
Answers
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 & 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 & 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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Answer:
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 & hence the bulb does not glow. Therefore LED is used in place of bulb because LED glows even when weak electric current flows