Current-time graphs of two different sources are shown in the following figures: Name any one source of each type of the current.

Graph I represent a DC current and graph II represent an AC current. Storage devices such as batteries give DC current whereas power coming from power stations is a source of AC.

Current-time graphs of two different sources are shown in the following figures: What is the frequency of the current in case B?

The current in figure B completes a cycle in 0 . 02 seconds . That is, it can complete 1 0 . 02 cycles in one second . So, the frequency f = 50 Hz .

Current-time graphs of two different sources are shown in the following figures: Now answer the following questions: Write two differences between the current types shown by graphs A and B.

Graph A represents a DC current and graph B represents an AC current. Alternating current Direct current In AC the flow of current changes its direction backwards periodically. It flows in a single direction steadily. The frequency of AC is depended upon the country. But, generally, the frequency is 50 Hz or 60 Hz . DC has no frequency or it has zero frequency.