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Question
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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Solution
The reason is that when the cell is being used, there is a drop in potential across the internal resistance of the cell.
RELATED QUESTIONS
What does an electric circuit mean?
Choose the correct alternative and rewrite the following sentence.
When the resistance of a conductor increases, the current will ________ increase.
Which of the following units could be used to measure electric charge?
(a) ampere
(b) joule
(c) volt
(d) coulomb
Fill in the folloing blank with suitable words:
A current is a flow of ............... .For this to happen there must be a ............... circuit.
Define the term resistivity.
A switch must be connected in ______.
Calculate the equivalent resistance between A and B in the adjacent diagram.
- What is meant by electric current?
- Name and define its unit.
- Which instrument is used to measure the electric current? How should it be connected in a circuit?
Match the following:
| 1. | 1 mA | a. | series |
| 2. | 1 pA | b. | ohmmeter |
| 3. | Ammeter | c. | 10-6 ampere |
| 4. | Electrical resistivity | d. | 10-3 ampere |
