Why Do We Use Ohm's Law?

Ohm’s law is an important law in electric circuits which represents the relationship between voltage, current, and resistance.

  • Ohm’s law can be used to control the amount of current that flows through a circuit by adding resistors in order to reduce the current flow or by removing the resistors to increase the flow of current.
  • Ohm’s law is useful in the analysis of the circuits, especially when it was combined with Kirchhoff’s Laws.

Related Questions

  1. What is the necessary condition for a conductor to obey Ohm's Law?
  2. Why is the curve representing Ohm's law linear?
  3. State Ohms law. How can it be verified experimentally?
  4. How do you find the resistance to Ohm's law?
  5. What are the 3 forms of Ohm's law
  6. What Is Ohm's Law Graph?
  7. What are the limitations of Ohm's Law?
  8. What are the applications of ohm's law used in daily life?
  9. State Ohms Law. Express It Mathematically. Define Si Unit Of Resistance.
  10. Is resistance constant in Ohm's law?
  11. Draw a circuit diagram to verify ohm’s law.

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CBSE CLASS XII Related Questions

  • 1.
    The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.


      • 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.
            Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

              • \( (M_x - M_z)<M_y \)
              • \( (M_x - M_y)<M_z \)
              • \( M_x>(M_y + M_z) \)
              • \( M_x<(M_y + M_z) \)

            • 4.
              This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?


                • 5.
                  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.


                    • 6.
                      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.

                        CBSE CLASS XII Previous Year Papers

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