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.