Your elders might have cautioned you against touching an electrical appliance with wet hands. But do you know why it is dangerous to touch an electrical appliance with wet hands?
The materials, which allow electric current to pass through them, are good conductors of electricity. On the other hand, materials, which do not allow electric current to pass through them easily, are poor conductors of electricity.
In the previously done experiment the students made a tester to test whether a particular material allows the electric current to pass through it or not. They found that metals such as copper and aluminium conduct electricity whereas materials such as rubber, plastic and wood do not conduct electricity.
They could recall and relate this activity to the previously done activity. However, so far they had used a tester to test materials which were in solid state. But what about liquids? Do liquids also conduct electricity? Let us find out what was the inference drawn by the students after conducting activity.
Electrical conductivity of liquids was tested by a simple activity by taking different liquid, like lemon juice, vinegar, tap water etc in a container, inserting electrodes in it, connecting the two electrodes to the terminals of a battery with a bulb (LED) between them. The bulb glows, indicating that the liquid is a conductor of electricity or not.