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

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

0.6

B

0.35

C

0.5

D

0.9

Text Solution

Verified by Experts

The correct Answer is:
D
0.9
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise AIPMT/NEET MCQS|31 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise NEET CAFE TOPICWISE PRATICE QUESTIONS (AC GENERATOR AND TRANSFORMER)|14 Videos

  • DUAL NATURE OF MATTER AND RADIATION

    MTG GUIDE|Exercise AIPMT/ NEET MCQs|30 Videos

  • ELECTROMAGNETIC WAVES

    MTG GUIDE|Exercise AIPMT/NEET(MCQs)|15 Videos

Similar Questions

Explore conceptually related problems

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.

MTG GUIDE-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS-CHECK YOUR NEET VITALS
  1. If resistance of 100Omega , inductance of 0.5 henry and capacitor of 1...

    Text Solution

    |

  2. Two circular loops of equal radii are placed coaxially at some separat...

    Text Solution

    |

  3. In a circuit, the instantaneous values of alternating current and volt...

    Text Solution

    |

  4. An alternating current is given by I = i1 cos omegat + i2 sin omegat...

    Text Solution

    |

  5. A series LCR circuit is connected to an ac source of frequency v and a...

    Text Solution

    |

  6. In a series LCR circuit R= 200(Omega) and the voltage and the frequenc...

    Text Solution

    |

  7. Two solenoids of equal number of turns have their lengths and the radi...

    Text Solution

    |

  8. If the number of turns per units length of a coils of solenoid is doub...

    Text Solution

    |

  9. A circular coil of radius 6 cm and 20 turns rotates about its vertical...

    Text Solution

    |

  10. A pair of adjacent coils has a mutual inductance of 2.5 H. If the curr...

    Text Solution

    |

  11. A wheel with 20 metallic spokes each of length 8.0 m long is rotated w...

    Text Solution

    |

  12. A metal conductor of length 1m rotates vertically about one of its end...

    Text Solution

    |

  13. An alternating current in a circuit is given by l = 20 sin ( 100pit + ...

    Text Solution

    |

  14. A capacitor of capacitance 10muF is connected to an AC source and an A...

    Text Solution

    |

  15. A 50 Hz AC signal is applied in a circuit of inductance of (1//pi)H an...

    Text Solution

    |

  16. An ac source of 50 V (r.m.s value) is connected across a series R - C ...

    Text Solution

    |

  17. In series LCR circuit R=18Omega and impedance is 33Omega . An r.m.s. v...

    Text Solution

    |

  18. In a series L.C.R. circuit alternating emf (v) and current (i) are giv...

    Text Solution

    |

  19. Alternating current of peak value ((2)/(pi)) ampere flows through the ...

    Text Solution

    |

  20. A transformer is used to light a 100 W and 110 V lamp from a 220V main...

    Text Solution

    |