If you add a cell to the circuit, will the lamps glow more brightly or less brightly?

How much work is done in moving a charge of $2 \mathrm{C}$ across two points having a potential difference $10 \mathrm{V}$?

How can a continuous flow of current be obtained? What are the sources of energy and name of the devices required for continuous flow of current?

Write the conventional symbol of the following component used in electric circuit diagram-

An electric cell

Can the current supplied by a dry cell give you an electric shock?