Question

Can we replace electricity supplied by the mains instead of an electric cell?

Answer 1

Answer:

Alternating current a.c. is one which is constantly changing i.e. the current flows in one direction and then in the opposite direction, again and again (continuously).

Answer 2

Answer:

Cells, batteries and the mains supply are all sources of electrical energy. We can use an oscilloscope to examine electrical signals to see how they change over time.