### Theory:

Electrical conductivity of water:
• Take water in a plastic container.
• Use LED instead of bulb since LED glows even when a weak electric current flows through it.
• Make a battery (a couple of cells) and connect its positive terminal to the longer lead of the LED. Put the negative terminal of the battery into the container contains water.
• Put the shorter lead of the LED too into the water using a wire.
• Make sure that both ends of the wire in the water do not touch and keep at least $$1$$ cm distance.
Experiment setup

In this experiment, we can see that the LED glows that means the circuit is closed; hence, the electricity passes through the water to complete the circuit. Thus, it proves that water is a good conductor of electricity.
Electrical conductivity of lemon juice:
Perform the above experiment replacing water in the container with lemon juice.

Experiment setup

LED glows since the lemon juice has an acid in it which is a good conductor of electricity.

The same result will be observed when we replace the lemon juice with vinegar.