Home
Class 12
PHYSICS
A transformer is used to light a 100W an...

A transformer is used to light a `100W` and `110V` lamp form a `220V` mains. If the main current is `0.5 A`, the efficiency of the transformer is approximately

A

0.3

B

0.9

C

0.1

D

0.5

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - B) (Objective Type Questions (One option is correct))|14 Videos

  • ALTERNATING CURRENT

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - C ) (Objective Type Questions) ( More than one option are correct)|2 Videos

  • ALTERNATING CURRENT

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|15 Videos

  • ATOMS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION J (Aakash Challengers )|5 Videos

Similar Questions

Explore conceptually related problems

A transformer is used to light a 100 W and 110 V lamp from a 220V mains. If the main current is 0.5 A , the Efficiency of the transformer is approximately:

A transformer is used to light a 100 W and 110 V lamp from a 220V mains. If the main current is 0.5 A , the Efficiency of the transformer is approximately:

A transformer is used to light a 100 W and 110 V lamp from a 220V mains. If the main current is 0.5 A , the Efficiency of the transformer is approximately:

A transformer is used to light a 100 W and 110 V lamp from a 220 V (Mains). If the main current is 0.5 A, the efficiency of the transformer is approximately

A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains. The current in mains cable is 0.7 A, find the efficiency of transformer.

A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains. The current in mains cable is 0.7 A, find the efficiency of transformer.

A step-down transformer is used on a 1000 V line to deliver 20A at 120V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is.

A transformer is employed to reduce 220V to 11V . The primary draws a current of 5A and the secondary 90A . The efficiency of the transformer is

A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60%. If the output power is 9 kW, then the input power will be

A power transmission line feeds input power at 2400V to a step-down transformer and which delivers power at 240V with its primary windings having 5000 turns . If the current in the primary coil of the transformer is 5A and its efficiency is 80%, then what is the output current (in A)?

AAKASH INSTITUTE ENGLISH-ALTERNATING CURRENT -Assignment (Section - A) ( Objective Type Questions ( One option is correct))
  1. The resonance frequency of a certain RLC series circuit is omega(0) . ...

    Text Solution

    |

  2. A variable inductor inductor is connected to an AC source. When induc...

    Text Solution

    |

  3. In series LCR AC circuit, the voltage of the source at any instant is ...

    Text Solution

    |

  4. In a series RLC circuit, if the frequency is increased to a very large...

    Text Solution

    |

  5. A series LCR circuit, has equal resistance capacitive reactance. What ...

    Text Solution

    |

  6. Consider an ac circuit where an incandescent light bulb is in series ...

    Text Solution

    |

  7. the following option is correctfor an ideal capacitor connected to a s...

    Text Solution

    |

  8. A power outlet puts out 60 Hz AC. Which of the following statements is...

    Text Solution

    |

  9. The ideal meter shown in figure read rms current and voltage. The aver...

    Text Solution

    |

  10. A transformer is used to light a 100W and 110V lamp form a 220V mains....

    Text Solution

    |

  11. In a series lags the applied emf. The rate at which energy is dissipat...

    Text Solution

    |

  12. The core of a transformer is laminated to reduce

    Text Solution

    |

  13. The primary coil of an ideal transformer has 100 turns and the seconda...

    Text Solution

    |

  14. Power factor is one for

    Text Solution

    |

  15. A sinusoidal alternating current of peak value (I0) passes through a h...

    Text Solution

    |

  16. An ac voltage is represented by E=220 sqrt(2) cos (50 pi) t How m...

    Text Solution

    |

  17. Two resistors are connected across an AC source of 5 V. The P.D. acro...

    Text Solution

    |

  18. In the figure, find the value of the applied voltage

    Text Solution

    |

  19. Refer to the series LCR AC circuit. Find the value of V(3)

    Text Solution

    |

  20. For an LCR series circuit with an aac source of angular frequency omeg...

    Text Solution

    |