Home
Class 12
PHYSICS
Maximum number bulbs of 60 W that can b...

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

A

40

B

36

C

10

D

60

Text Solution

Verified by Experts

On a line, the bulbs are connected in parallel.
Current drawn by one bulb =1
`therefore` Power =VI
60=220I
or `I=(60)/(220)=(3)/(11)` amp.
When n bulb at the most are connected.
Total current `-nl=(3n)/(11)`
`(3n)/(11)=10`
or `n=36`.
Promotional Banner

Topper's Solved these Questions

  • CIRCULAR MOTION

    ALLEN|Exercise EXERCISE (J-A)|6 Videos

  • GEOMETRICAL OPTICS

    ALLEN|Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

(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 ?

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?

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W . How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A ?

A house hold circuit has a fuse of 5 A rating. Calculate the maximum number of bulbs of rating 60 W - 220 V each which can be connected in this house hold circuit.

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.

How many sixty watt (60 W) bulbs may be safely used in a 240-V supply with 4-ampere fuse?

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?

ALLEN-CURRENT ELECTRICITY-All Questions
  1. A heater coil connected to a supply of a 220 V is dissipating some pow...

    Text Solution

    |

  2. The thermo emf E of a thermocouple is found to vary wit temperature T ...

    Text Solution

    |

  3. Maximum number bulbs of 60 W that can be used in a 220V supply line p...

    Text Solution

    |

  4. A 5-A wire can withstand a maximum power of 1W in circuit. The resista...

    Text Solution

    |

  5. The temperature of inversion of a thermocouple is 620^(@)C and the neu...

    Text Solution

    |

  6. For ensuring dissipation of same energy in all three resistors (R(1), ...

    Text Solution

    |

  7. Power dissipated across the 8 Omega in the circuit shown here is 2 W. ...

    Text Solution

    |

  8. The electrochemical equivalent of a substance is numerically equal to ...

    Text Solution

    |

  9. The total power dissipated in watts in the circuit shown here is

    Text Solution

    |

  10. A steady current of 1.5 A flows through a copper voltameter for 10 min...

    Text Solution

    |

  11. If the cold junction of thermocouple is kept at 0^(@)C and the hot jun...

    Text Solution

    |

  12. An electric kettle takes 4 A current at 220 V. How much time will it t...

    Text Solution

    |

  13. A thermoelectric refrigerator works on

    Text Solution

    |

  14. E.M.F. of a thermocouple is 25 mV//.^(@)C A galvanometer whose resist...

    Text Solution

    |

  15. At neutral temperature, the thermoelectric power ((dE)/(dT)) has the v...

    Text Solution

    |

  16. In producing chrlorine through electorlysis, 100 kW power at 125 V is ...

    Text Solution

    |

  17. The thermo e.m.f. E in volts of a certain thermocouple is found to var...

    Text Solution

    |

  18. A light bulb is rated 100W for a 220V supply. The resistance of the bu...

    Text Solution

    |

  19. The rate of increase of thermo-emf with temperature at the neutral tem...

    Text Solution

    |

  20. A thermocouple of negligible resistance produces an emf fo 40 mu V//^(...

    Text Solution

    |