Question

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

Answer 1

In testing the electrical conductivity of liquid current flow is very low. when a current passes through a a bulb it's filament gets heated up and light. But the current flow in liquid is so low that it is not sufficient to light up a bulb.

LED on the other hand require very low amount of current to produce light. Hence they will glow even in very less current.

Hence LED is used to detect very low current which may not be noticed by a bulb.

Answer 2

Answer:

The advantage of using LEDs is because, they glow up even if very small amount of current passes through them.