1.Why is the LED used in place of a an electric bulb for making a tester to check the conduction of current through a liquid?
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Explanation:
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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