In the diagrams shown below:
$(i)$ Name the type of current in two cases.
$(ii)$ Identify any one source for each type of these currents.
$(iii)$ What is the frequency of current in case $(ii)$ in India?
$(iv)$ Use above graphs to write two differences between the current in two cases.

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(N/A) $(i)$ The current is direct current $(dc)$ in the first case and is alternating current $(ac)$ in the second case.
$(ii)$ $(a)$ Battery $(b)$ $ac$ generator.
$(iii)$ $50 \ Hz$.
$(iv)$
$dc$$ac$
Current always flows in the same direction.Current changes magnitude and direction periodically.
Cannot be easily converted into $ac$.Can be easily converted into $dc$.

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