Home
Class 12
PHYSICS
How a transformer affects the voltage an...

How a transformer affects the voltage and current ?

Text Solution

Verified by Experts

For an ideal transformer,
`(I_(p))/( I_(s)) = (V_(s))/( V_(p)) = ( N_(s))/( N_(p))`
(i) If the secondary coil has a greater number of turns than the primary `( N_(s) gt N_(p))` . The voltage is stepped up `( V_(s) gt V_(p))` . Meas voltage increased more in secondary than primary and `I_(p) gt I_(s)` the current in secondary becomes less than form primary.
(iii) If the secondary coil has a lesser number of turns than the primary `( N_(s) lt N_(p))` the voltage is stepped down `(V_(s) lt V_(p))` , means voltage decrased more in secondary than primary and `I_(p) lt I_(s)`. The current in secondary becomes more than from primary.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION B NUMERICALS (TEXTUAL ILLUSTRATIONS)|33 Videos

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION B NUMERICALS ( TEXTUAL EXERCISE )|13 Videos

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION-D MCQs (COMPETITIVE EXAMS)|64 Videos

  • ATOMS

    KUMAR PRAKASHAN|Exercise Section-D -MCQs asked in GUJCET / Board Exam|34 Videos

Similar Questions

Explore conceptually related problems

Transformation ratio of one transformer is 1:2. If Leclanche cell having emf 1.5 V is connected to primary coil of a transformer then voltage obtained across its secondary is ………..

The ratio of number of turns in primary and secondary coil of a transformer is 1:20 the ratio of current in primary and secondary coils will be ....

A transformer is having 2100 turns in primary and 4200 turns in secondary. An A.C. source of 120 V, 10 A is connected to its primary, the secondary voltage and current are …….

In an ideal transformer, the voltage is stepped down from 11 kV to 220 V. If the primary current be 100 A, the current in the secondary should be ……

In a noiseless transformer, an alternating current of 2A is flowing in primary coil. The number of turns in primary and secondary coil are 100 and 20 respectively the secondary current is .........

A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary coil ? Comment on the type of transformer being used.

If current is not obtained from secondary coil of an ideal transformer, then the power factor of primary coil of transformer is .........

Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved). Hence, explain why high voltage transmission is preferred?

KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-A (QUESTIONS-ANSWERS)
  1. Obtain an equation for sharpness of resonance in an L-C-R series AC ci...

    Text Solution

    |

  2. Obtain the equation of the bandwidth for an L-C-R series AC circuit an...

    Text Solution

    |

  3. What is sharpness of resonance ? Derive equation of Q-factor

    Text Solution

    |

  4. If L= 1.00 mH, C = 1.00nF, then find the resonant frequency.

    Text Solution

    |

  5. Define the power for AC circuit. Obtain an equation of average power f...

    Text Solution

    |

  6. Write an equation of average power for L-C-R series AC circuit and dis...

    Text Solution

    |

  7. What is meant by LC circuit? What are LC oscillations ?

    Text Solution

    |

  8. Obtain the differential equation for a LC circuit.

    Text Solution

    |

  9. Solve the differential equation of L-C circuit and obtain the expressi...

    Text Solution

    |

  10. Explain how LC oscillations takes place in the circuit.

    Text Solution

    |

  11. Compare the oscillations in an LC circuit are analogous to the oscilla...

    Text Solution

    |

  12. For which 2 reasons the discussion of LC oscillations is not realistic...

    Text Solution

    |

  13. Compare LC oscillations and a force damped oscillations in mechanics.

    Text Solution

    |

  14. What is transformer ? Write its principle and write its construction.

    Text Solution

    |

  15. Write the working procedure of transformer.

    Text Solution

    |

  16. Using the equation of power for an ideal transformer, prove (I(p))/( I...

    Text Solution

    |

  17. How a transformer affects the voltage and current ?

    Text Solution

    |

  18. Due to which reasons the energy losses do occurs in actual transformer...

    Text Solution

    |

  19. Explain the use of transformer for distribution of power over long dis...

    Text Solution

    |

  20. Write important uses of transformer.

    Text Solution

    |