Home
Class 12
PHYSICS
A transformer changes the voltage...

A transformer changes the voltage

Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    NARAYNA|Exercise Assertion & Reason|14 Videos

  • ALTERNATING CURRENT

    NARAYNA|Exercise LEVEL - I (C.W)|23 Videos

  • ALTERNATING CURRENT

    NARAYNA|Exercise LEVEL - II(H.W)|13 Videos

  • ATOMIC PHYSICS

    NARAYNA|Exercise LEVEL-II (H.W)|14 Videos

Similar Questions

Explore conceptually related problems

Assertion : A step-up transformer changes a low voltage into a high voltage. Reason : This violate the law of conservation of energy.

Is energy produced when a transformer steps up the voltage?

Statement (A) : Step up transformer converts low voltage, high current to high voltage, low current Statement (B) : Transformer works on both ac and dc.

In a step - down transformer the input voltage is 22kV and the output voltage is 550V The ratio of the number of turns in the secondary to that in the primary is .

In a step up transformer, the input voltage is 300 V and the output voltage is 15 KV. Then the ratio of the number of turns in the primary to that in the secondary is

Does a transformer change the frequency of a.c. ?

In an ideal step down transformer, the input voltage is 400V and the output voltage is 20 V. The output voltage is used to operate a device, having an impendance of 100 ohms. What is the current in the primary circuit?

In an ideal transformer, the voltage and current in the primary are 200V and 2 A respectively and voltage in secondary is 2000V . The value of the current in secondary is

NARAYNA-ALTERNATING CURRENT-C.U.Q
  1. A transformer changes the voltage

    Text Solution

    |

  2. In an ac circuit the current

    Text Solution

    |

  3. The average emf during the positive half cycle of an ac supply of peak...

    Text Solution

    |

  4. Alternating current is transmitted to distant places at

    Text Solution

    |

  5. In case of a.c circuit, Ohm's law holds good for {:a) Peak values of...

    Text Solution

    |

  6. In case of AC circuits the relation V = iZ, where Z is impedance, can ...

    Text Solution

    |

  7. Alternating current can not be measured by D.C. Ammeter because

    Text Solution

    |

  8. The r.m.s value of Potential due to superposition of given two alterna...

    Text Solution

    |

  9. If the instantaneous current in a circuit is given by i=2cos (omegat-p...

    Text Solution

    |

  10. If a capacitor is connected to two different A.C generators, then the ...

    Text Solution

    |

  11. In general in an alternating current circuit

    Text Solution

    |

  12. The magnitude inducted e.m.f. in an LR circuit at brea of circuit as c...

    Text Solution

    |

  13. The emf and current in a circuit are such that E = E(0) sin omega t an...

    Text Solution

    |

  14. The correct variation of resistance R with frequency f is given by

    Text Solution

    |

  15. Same current is flowing in two alternating circuits. The first circuit...

    Text Solution

    |

  16. When an a.c source is connected across a resistor

    Text Solution

    |

  17. The phase angle between current and voltage in a purely inductive circ...

    Text Solution

    |

  18. Ratio of impedence to capactive reactance has

    Text Solution

    |

  19. An inductor-coil having some resistance is connected to an AC source. ...

    Text Solution

    |

  20. Why the current does not rise immediately in a circuit containing indu...

    Text Solution

    |

  21. In an AC circuit containing only capacitance the current

    Text Solution

    |