The combination of two or more cells is called a  .

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

A wire joint

$15$ cells each of emf $2$ volt are connected in series but $2$ of them are connected wrongly. Calculate the emf of the combination.

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

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

Electric bulb

In the given circuit diagram, identify the objects marked as $1, 2, 3$.

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

An electric cell

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?

Differentiate between the following.

Cell and battery

The statements given below are incorrect. Write the correct statements.

$1.$ An electric cell is a device in which electricity changes into chemical energy.