Sofia and Zara have made a circuit to test whether different objects are electrical conductors or electrical insulators. How can they test that their circuit works? The objects tested are coin, chopstick, glass and plastic spoon.

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?

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

State one relevant reason for the following:

• Graphite anode is preferred to platinum in the electrolysis of molten lead bromide.

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

State one relevant observation for of the following:

At the anode, when molten lead bromide is electrolyzed using graphite electrodes.

What is a conductor of electricity? Give two examples.