We should not experiment with electric supply from mains as supply is very strong and of a high voltage. It may be very dangerous. We should experiment with electric cells only.

The solutions of acids, bases and salts conduct electricity. This can be experimentally proved by following methods:
(i) Take three clean plastic or rubber caps of bottles.
(ii) Pour about two teaspoonfulls of distilled water in each of them.
(iii) Add few drops of lemon juice in one cap.
(iv) Add few drops of base as caustic soda in second cap.
(v) Add little salt to third cap to form salt solution.
(vi) Now conduct electricity through each. An electric current flows through all the conducting solutions thus indicating that acids, bases and salts conduct electricity.

The possible reasons are as follows:
(i) The current is not produced by the given liquid and hence, bulb does not glow.
(ii) Connections are loose.
(iii) Bulb is fused.
(iv) Cells are used up.

The ordinary water we get from the tap, river, lakes and ponds is not as pure as distilled water. It contains so many impurities in the form of the salts. These impurities make it good conductor of electricity. As distilled water is free from salt, it is unable to conduct electricity.

Due to the heating effect of current, the filament of the bulb gets heated to a high temperature and it starts glowing. However, if the current passing through a circuit is too weak, the filament does not get heated sufficiently and it does not glow.

Distilled water is not a good conductor of electricity but adding common salt make it conducting.

As sea water contains more salt which increases conductivity. So, sea water is a good conductor of electricity.

The electric current produces the magnetic field under which a current carrying wire behaves like a magnet.

Electroplating is the process of depositing a layer of any desired metal on another metal by means of electricity.
Advantages of electroplating:
(i) It is used to coat a desired metal on another metal.
(ii) It protects the metals from corrosion.
(iii)It also prevents the metallic surface from rusting.
(iv) Some cheap and dull metals are coated with costly and shinning metals for ornamental use.
(v) It can make more reactive metals like iron less reactive.
(vi) Coating of chromium on metals gives luster to object

We take CuS04 solution and dip a pure copper plate as cathode (-ve) and impure copper plate as anode (+ve). Due to voltage of battery, the impurities from the impure sample slowly deposit at the bottom and the copper plate becomes purified .