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.
    Capacitors are manufactured with certain standard capacitances and working voltages. However, these standard values may not be the ones that are actually needed in a particular application. Two or more capacitors can be grouped in series or in parallel to achieve desired capacitance and voltage. When connected in series, the total capacitance decreases while the voltage rating increases, whereas in parallel connections, the total capacitance increases and maintains the same voltage rating. A capacitor stores energy in the electric field between its plates and stored energy is proportional to the square of the voltage and capacitance $U = \frac{1}{2}CV^2$, where symbols have their usual meanings.
    Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }


      • 2.
        Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.


          • 3.
            A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.


              • 4.
                An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.


                  • 5.
                    Read the following paragraph and answer the questions that follow.
                    A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.


                      • 6.
                        Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.

                          CBSE CLASS XII Previous Year Papers

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