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.
    A long solenoid of length \( L \) and radius \( r_1 \) having \( N_1 \) turns is surrounded symmetrically by a coil of radius \( r_2 \, (r_2>r_1) \) having \( N_2 \) turns (\( N_2 \ll N_1 \)) around its mid-point. Derive an expression for the mutual inductance of solenoid and coil. Is \( M_{12} = M_{21} \) valid in this case?


      • 2.
        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?


          • 3.
            Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.


              • 4.
                Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.


                  • 5.
                    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 \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]


                      • 6.
                        If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

                          CBSE CLASS XII Previous Year Papers

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