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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
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
Name the unit of electrical resistance and give its symbol.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
Fig. represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.
Choose the correct alternative.
Which of the following is an ohmic conductor?
Ohm’s law states the relationship between power and voltage.
What is ohmic device?
What is meant by resistance of a conductor ? Define its SI unit.
