Name the Commercial Unit of Electric Energy

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The commercial unit of electric energy is the kilowatt-hour (kWh). Electric energy is the energy produced by the movement of electric charge. It can take the form of electromagnetic radiation, such as light, or it can be stored in electric fields and magnetic fields. Electric energy can be harnessed to power a wide range of technologies, including electrical appliances, lighting, transportation, and communication systems.

The properties of electric energy include:

  1. Ability to transfer energy through electrical conductors.
  2. Ability to be transformed into other forms of energy.
  3. Ability to be stored in electric fields and magnetic fields.

Kilowatts Explained

Kilowatts Explained

A kilowatt-hour (kWh) is a unit of energy commonly used to measure the amount of electricity used by households and businesses. It is equal to the amount of energy consumed by a 1 kilowatt (kW) appliance over a period of 1 hour. For example, if a 100-watt light bulb is turned on for 10 hours, it would consume 1 kilowatt-hour of energy.

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CBSE CLASS XII Related Questions

  • 1.
    Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from this plot.


      • 2.

        A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

          • 5 V
          • 3.5 V
          • 2.5 V
          • Zero V

        • 3.

          Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.


            • 4.
              A wire of length \(L\) is bent round into (i) a square coil having \(N\) turns and (ii) a circular coil having \(N\) turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a uniform, horizontal magnetic field and carry the same currents. Find the ratio of the maximum value of the torque acting on the square coil to that on the circular coil.


                • 5.
                  In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

                    • \(10\ \text{N/C}\) along \(+x\)
                    • \(10\ \text{N/C}\) along \(-x\)
                    • \(50\ \text{N/C}\) along \(+x\)
                    • \(50\ \text{N/C}\) along \(-x\)

                  • 6.
                    Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

                      • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})\)
                      • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})\)
                      • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})\)
                      • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})\)
                    CBSE CLASS XII Previous Year Papers

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