Mention the difference between the Primary cell and the secondary cell.

Write in brief the basic principle of hydroelectric power generation.

What type of energy is transformed to electrical energy in a dynamo?

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

An electric cell

Answer the following:

What is the frequency of household alternating current $\left(\mathrm{AC}\right)$ in India?

Consider an electrical conductor connected across a potential difference $V.$ Let $\Delta q$ be a small charge moving through it in time $\Delta t$. If $I$ is the electric current through it,
(i) the kinetic energy of the charge increases by $IV\Delta t$
(ii) the electric potential energy of the charge decreases by $IV\Delta \mathrm{t}$.
(iii) the thermal energy of the conductor increases by $IV\Delta \mathrm{t}$.

Then the correct statements is/are

You are given following current $\left(I\right)$ - time $\left(t\right)$graphs.

(a) Name the type of current in each case.

(b) Identify one source for each of the currents.

Name the electrical component that is described by the symbol: