The transformer ratio in the step-up transformer is?

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Jasmine Grover

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The transformer ratio in a step-up transformer is greater than 1.

In a step-up transformer, the number of turns in the secondary winding is greater than the number of turns in the primary winding. This means that the voltage in the secondary winding is higher than the voltage in the primary winding.

The ratio of the number of turns in the secondary winding to the number of turns in the primary winding determines the voltage transformation ratio of the transformer.

For example, if a transformer has a turns ratio of 1:10, this means that there are 10 turns in the secondary winding for every 1 turn in the primary winding, resulting in a voltage transformation ratio of 10:1. As a result, a low voltage applied to the primary winding will be transformed into a higher voltage on the secondary winding.

Step up transformer

We know that the transformer ratio is given by, k = NS/NP = ES/EP

For a step-up transformer, ES>EP

So, k > 1

The transformer ratio in the step-up transformer is greater than 1.

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CBSE CLASS XII Related Questions

  • 1.
    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:

      • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})\)
      • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})\)
      • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})\)
      • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})\)

    • 2.

      A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.


        • 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 current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.


                • 5.

                  A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

                    • the induced current will flow in the anticlockwise direction.
                    • the induced current will flow in the clockwise direction.
                    • no induced current will flow in the solenoid.
                    • the magnet will fall with a constant velocity.

                  • 6.
                    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.

                      CBSE CLASS XII Previous Year Papers

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