Which effect of electric current is utilized for detecting the flow of current through a solution:

(a) when a torch bulb is used?

(b) when a compass is used?

Why is it dangerous to touch a working electrical appliance with wet hands?

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

What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?

Explain why, distilled water does not conduct electricity but tap water conducts some electricity.