Home
Class 12
PHYSICS
A house, served by a 220 V supply line, ...

A house, served by a 220 V supply line, is protected by a 9A fuse. What is the maximum number of 60 watt bulbs that can be turned on in parallel?

A

11

B

22

C

33

D

44

Text Solution

Verified by Experts

The correct Answer is:
C

We know `P=Vxx1`
Let maximum number of 60 watt bulb be x.
Then `60x=220xx9`
`:." "x=33`
Promotional Banner

Topper's Solved these Questions

  • Heat & Thermodynamics

    NDA PREVIOUS YEARS|Exercise Physics|64 Videos

Similar Questions

Explore conceptually related problems

A house writing, supplied with a 220V supply line is protected by a 9 ampere fuse. Find the maximum number of 60 W in parallel that can be turned on.

A factory is served by a 220 V supply line. In a circuit protected by a fuse marked 10 A, the maximum number of 100 W lamps in parallel that can be turned on, is

A circuit has a fuse of 5 A. What is the maximum number of 100 W (220 V) bulbs that can be safely used in the circuit ?

[" 120-V DC power line is protected by a "15" -A fuse.What is the maximum number of "],[120V,500W" purely resistive light bulbs that can be operated at full brightness from this line in parallel? "]

A circuit has a fuse having a rating of 5 A. What is the maximum number of 100 W-220 V bulbs that can be safely connected in parallel in the circuit?

(a) When does a fuse cut off current ? How does it do it ? (b) What is the maximum number of 60 W bulbs that can be run from the mains supply of 220 volts if you do not want to overload a 5 A fuse ?

Maximum number bulbs of 60 W that can be used in a 220V supply line protected by a 10A fuse is

The supply voltage to room is 120 V. The resistance of the lead wires is 6Omega . A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

NDA PREVIOUS YEARS-ELECTRICITY & MAGNETISM -MCQ
  1. Which one of the following is the resistance that must be placed paral...

    Text Solution

    |

  2. An electric iron of resistance 20 Omega takes a current of 5 A. Calcul...

    Text Solution

    |

  3. A house, served by a 220 V supply line, is protected by a 9A fuse. Wha...

    Text Solution

    |

  4. The effective resistance of three equal resistances, each of resistanc...

    Text Solution

    |

  5. The magnetic lines of force due to the bar magnet

    Text Solution

    |

  6. The specific resistance of a conducting wire depends upon

    Text Solution

    |

  7. Which one of the statement given below is not correct?

    Text Solution

    |

  8. How many sixty watt (60 W) bulbs may be safely used in a 240-V supply ...

    Text Solution

    |

  9. Magnetism of a bar magnet can be destroyed if it is (I) kept in the ...

    Text Solution

    |

  10. Capacity of a parallel plate condenser can be doubled by (I) doublin...

    Text Solution

    |

  11. If two conducting spheres are separately charged and then brought in c...

    Text Solution

    |

  12. Two pieces of metallic wire having equal lengths and equal volume plac...

    Text Solution

    |

  13. If a heater coil is cut into two equal parts and only one part is used...

    Text Solution

    |

  14. The direction of magnetic field at a point due to an infinitely long w...

    Text Solution

    |

  15. A hollow metal ball carrying an electric charge produces no electric f...

    Text Solution

    |

  16. The material used for electric fuse is an alloy of tin and lead. This ...

    Text Solution

    |

  17. The lines of force of uniform magnetic field

    Text Solution

    |

  18. If the electrical resistance of a typical substance suddenly drops to ...

    Text Solution

    |

  19. Magnets attract magnetic substances are iron, nickel, cobalt, etc. The...

    Text Solution

    |

  20. Two copper wires A and B of length l and 2l respectively, have the sam...

    Text Solution

    |