What are ohmic and non-ohmic devices? Give examples.

Ohmic devices are the devices that follow Ohm’s law. Examples: wire and resistor.

Non-Ohmic devices are devices that do not follow Ohm’s law. Examples: vacuum tubes and thermistors.


Related Questions

  1. Define: 1 volt, Potential difference
  2. What is the necessary condition for a conductor to obey Ohm's Law?
  3. A small bulb has a resistance of 2 ohms when it is cold. It draws 0.4-ampere current from a source of 4V and then starts glowing. Calculate the resistance when it is glowing
  4. What Is Effective Resistance?
  5. Why is the curve representing Ohm's law linear?
  6. Obtain the equation J = σE of Ohm's law on the basis of drift velocity
  7. State Ohms law. How can it be verified experimentally?
  8. Draw a circuit diagram to verify ohm’s law.
  9. State And Explain Joules Law Of Heating.
  10. State Ohms Law. Express It Mathematically. Define Si Unit Of Resistance.
  11. Obtain the equation of Ohm's law on the basis of drift velocity
  12. What Is The Basic Principle Of Ohm's Law?
  13. Is resistance constant in Ohm's law?
  14. Why Do We Use Ohm's Law?
  15. What are the applications of ohm's law used in daily life?

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CBSE CLASS XII Related Questions

  • 1.
    Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]


      • 2.
        If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.


          • 3.
            The figure shows three point charges kept at the vertices of triangle ABC. The net electric field, due to this system of charges, at the midpoint M of base BC will be:

              • \( \frac{q}{4 \pi \epsilon_0 l^2} \) pointing along MA
              • \( \frac{q}{\pi \epsilon_0 l^2} \) pointing along AM
              • \( \frac{q}{2 \pi \epsilon_0 l^2} \) pointing along AM
              • Zero

            • 4.
              Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).


                • 5.
                  What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?


                    • 6.
                      Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

                        CBSE CLASS XII Previous Year Papers

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