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प्रश्न
Point out two differences between e.m.f. and potential difference as applied to electric circuits.
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उत्तर
Electromotive force or e.m.f. of a cell is potential difference between its two electrodes when it is in open circuit, i.e., not sending current in the external circuit; while potential difference is the difference in potential between the terminals when the cell is in closed circuit or it is sending current in the given circuits, e.m.f. is always greater than potential difference or terminal voltage of a cell on account of energy being spent in driving charge through the circuit.
संबंधित प्रश्न
Name a device that helps to maintain a potential difference across a conductor.
By what other name is the unit joule/coulomb called?
Name the law which relates the current in a conductor to the potential difference across its ends.
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Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity.
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Define the following:
Potential difference
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is doubled itself.
Potential near a charge is the measure of its ______ to bring a positive charge at that point.
Name the instrument which is used to measure the potential difference.
