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प्रश्न
State the limitations of Ohm’s law.
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उत्तर
There are two main limitations:
(i) Temperature,
(ii) Physical condition of the conductor.
It is found that the ratio V/I is mo longer constant when the temperature is not kept constant. Generally, resistance increases with the rise in the temperature of the conductor.
Physical conditions of any conductor mainly include:
(i) Its length,
(ii) Its cross-sectional area,
(iii) The kind of material.
If there is no change in any of the above three conditions and also other condition like temperature remains constant, then Ohm’s law holds good, i.e., the ratio V/I remains constant.
संबंधित प्रश्न
Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
Name the physical quantity whose unit is "ohm".
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
The graph between V and I for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it.
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
Ohm's law deals with the relationship between ______
