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प्रश्न
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उत्तर
According to Ohm’s law, the current flowing in a conductor is directly proportional to the potential difference across its ends, provided the physical conditions and temperature of the conductor remain constant.
No, it is not always true. E.g., Diode valve, junction diode, etc., do not obey Ohm’s law.
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संबंधित प्रश्न
What is Resistivity?
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.
A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?
Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination.
How does an increase in the temperature affect the specific resistance of a :
(i) Metal and
(ii) Semiconductor ?
State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this. relationship.
State and define Ohm’s law.
State the limitations of Ohm’s law.
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
