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Electric Current

You are given...

Question

You are given following current-time graphs from two different sources:

(a) Name the type of current in two cases.
(b) Identify any one source for each type of these currents.
(c) What is the frequency of current in case II in India?
(d) Use above graphs to write one difference between the current in two cases.

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Solution

(a) The current shown in the graph 'I' is a DC(Direct current). Whereas the current shown in graph 'II' is an AC(Alternating current).
(b) An AC generator can be used to produce Alternating current(AC) and Direct current or DC can be produced by batteries or cells.
(c) Frequency of the Alternating current in India is 50 Hz.
(d) The main difference between the current in two cases is that in direct current (DC), the electric charge (current) flows only in one direction. But, in alternating current (AC), on the other hand, the charge flow (current) changes direction periodically.

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Q. You are given following current - time graph from two different sources:
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 difference between the current in two cases.

Q. Figures (a) and (b) show two alternating circuits with equal currents. If frequency of alternating emf be increased, what will be the effect on maximum currents in the two cases?

Q. Two resistors, with resistance 5 Ω and 10 Ω respectively are to be connected to a battery of emf 6 V so as to obtain:

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(d) What is the frequency of A.C. supply in India ?

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