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प्रश्न
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
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उत्तर
The reason is that when the cell is being used, there is a drop in potential across the internal resistance of the cell.
संबंधित प्रश्न
1 A = _________ mA
- 102
- 103
- 10-3
- 10-6
Define the unit of current.
If 20 C of charge pass a point in a circuit in 1 s, what current is flowing?
What is the conventional direction of the flow of electric current? How does it differ from the direction of flow electrons?
Which type of circuit, series or parallel, is preferred while connecting a large number of bulbs:
(b) for lighting inside the rooms of the hotel?
Distinguish between an open and a closed circuit.
A wire is passed through a piece of cardboard as shown in fig .. An electric current flows vertically down the wire and then flows back up. The two sections of the write are observed to repel each other.
(a) Wi th the aid of a diagram, describe how you would plot the magnetic field lines on the card .
(b) Sketch the magnetic field patterns around both the sections of the wire. Use your sketch to explain why the two sections repel each other.
(c) The repulsive force between the two sections is small. What changes could be made to increase it?
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
Match the items in column-I to the items in column-II:
| Column - I | Column - II |
| (i) electric current | (a) volt |
| (ii) potential difference | (b) ohm meter |
| (iii) specific resistance | (c) watt |
| (iv) Electrical power | (d) joule |
| (v) electrical energy | (e) ampere |
