Explain a simple circuit with a circuit diagram.

$15$ 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 $10 \mathrm{V}$?

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

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?

Draw in your notebook the symbols to represent the following components of electrical circuits:

connecting wires, switch in the 'OFF' position, bulb, cell, switch in the 'ON' position, and battery.

Would the bulb glow in the following circuits. Give reason for your answer.

Fig (a)

Fig (b)

Fig (c)