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Home/chapter 7 alternating current

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Maninder Singh
Maninder Singh
Asked: December 19, 2024In: Class 12 Physics

How is the large scale transmission of electric energy overlong distances donewith the use of transformers?

Large-scale transmission of electric energy over long distances is achieved using transformers. Step-up transformers at power plants increase voltage, reducing current to minimize transmission losses. High-voltage electricity travels through transmission lines efficiently. At distribution points, step-down transformers lower the voltage ...

chapter 7 alternating currentclass 12 physicsthe large scale transmission of electric energy
  • 1 1 Answer
  • 8 Views
  • 1 Vote
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Maninder Singh
Maninder Singh
Asked: December 19, 2024In: Class 12 Physics

State the underlying principle of a transformer.

The transformer works on the principle of electromagnetic induction (Faraday’s law of induction). When an alternating current flows through the primary winding, it creates a changing magnetic flux in the transformer core. This flux induces a voltage in the secondary ...

chapter 7 alternating currentclass 12 physicsthe underlying principle of a transformer
  • 1 1 Answer
  • 6 Views
  • 1 Vote
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Maninder Singh
Maninder Singh
Asked: December 19, 2024In: Class 12 Physics

Mention various (any four) energy losses in a transformer.

Here are four common energy losses in a transformer: (i) Core Loss (Iron Loss): This occurs in the transformer core due to hysteresis and eddy currents when it is subjected to alternating magnetic fields. (ii) Copper Loss (Winding Resistance ...

chapter 7 alternating currentclass 12 physicsenergy losses in a transformer
  • 1 1 Answer
  • 25 Views
  • 1 Vote
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Maninder Singh
Maninder Singh
Asked: December 19, 2024In: Class 12 Physics

A step up transformer converts a low input voltage into a high output voltage. Does it violate law of conservation of energy? Explain.

A step up transformer does not violate the law of conservation of energy. Although it enhancesthe output voltage but correspondingly reduces, the circuit current so that power output of even an ideal transformer is same as the power input. Class ...

chapter 7 alternating currentclass 12 physicstransformer converts a low input voltage into a high output voltage
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  • 1 Vote
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Teju Singh
Teju Singh
Asked: December 18, 2024In: Class 12 Physics

Explain why the reactance offered by a capacitor decreases with increasing frequency of an alternating voltage.

We know that a capacitor does not allow of direct current through it because the gap between the two plates of capacitor offers an infinite resistance. when an alternating voltage is applied across a capacitor, the capacitor plates are alternately ...

chapter 7 alternating currentclass 12 physicsthe reactance of a capacitor change with an increase in the frequency of an alternating voltage
  • 1 1 Answer
  • 35 Views
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