Home
Class 12
PHYSICS
How many 60 W lamps may be safely run o...

How many `60 W` lamps may be safely run on a `230 V` circuit fitted with a ` 5 A` fuse?

A

`11`

B

`22`

C

`33`

D

`66`

Text Solution

Verified by Experts

The correct Answer is:
B
Current required by each bulb is
`I = (P)/(v) = (100)/(220)A`
If `n` bulbs are joined in parallel , then
`nI = I_(fuse) or n xx (100)/(220) = 10 or n = 22`
Promotional Banner

Topper's Solved these Questions

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Multiple Correct|5 Videos

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Assertion - Reasoning|6 Videos

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Subjective|8 Videos

  • GRAVITATION

    CENGAGE PHYSICS|Exercise Question Bank|39 Videos

  • INDUCTANCE

    CENGAGE PHYSICS|Exercise Concept Based|9 Videos

Similar Questions

Explore conceptually related problems

How many 60W bulbs may be safely used on 220V line using a 5A fuse?

How many 60W bulbs may be safely used on 220V line using a 5A fuse?

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

The maximum number of 40 W tube-lights connected in parallel which can safely be run from a 240 V supply with a 5 A fuse is :

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

A 60 V -10W lamp is to be run on AC supply of 100 V -50 cycle in series with a suitable capacitor .Find the capactiance of the capacitor that be needed for the purpose.

A 110 V, 60 W lamp is run from a 220 V AC mains using a capacitor in series with the lamp, instead of a resistor then the voltage across the capacitor is about:

CENGAGE PHYSICS-HEATING EFFECT OF CURRENT-Single Correct
  1. Four resistances carrying a current shown in Fig. 7.41 are immersed in...

    Text Solution

    |

  2. The three resistance of equal value are arranged in the different comb...

    Text Solution

    |

  3. An ideal gas is filled in a closed rigid and thermally insulated conta...

    Text Solution

    |

  4. The resistance in which the maximum heat is produced is given by ( Fig...

    Text Solution

    |

  5. The resistance of hot tungsten filament is about 10 times the cold res...

    Text Solution

    |

  6. The resistance of the filament of a lamp increases with the increase i...

    Text Solution

    |

  7. A wire of length L and 3 identical cells of negligible internal resist...

    Text Solution

    |

  8. An electric immersion heater of 1.08 kW is immersed in water . After i...

    Text Solution

    |

  9. Two electric bulbs A and B are rated 60 and 100 W, respectively. If th...

    Text Solution

    |

  10. A 25 W, 220 V bulb and a 100 W , 220 V bulb are connected in series ac...

    Text Solution

    |

  11. Two identical heaters rated 220 V , 1000 W are paced in series with ea...

    Text Solution

    |

  12. Figure 7.44 shows three similar lamps L(1) , L(2), and L(3) connectged...

    Text Solution

    |

  13. If a wire of resistance 20 Omega is covered with ice and a voltage of ...

    Text Solution

    |

  14. How many 60 W lamps may be safely run on a 230 V circuit fitted with ...

    Text Solution

    |

  15. It takes 16 min to boil some water in an electric kettle. Due to some ...

    Text Solution

    |

  16. A electric kettle ( rated accurately at 2.5 kW) is used to heat 3 kg o...

    Text Solution

    |

  17. How many 60 W lamps may be safely run on a 230 V circuit fitted with ...

    Text Solution

    |

  18. If a given volume of water in a 220 V heater is boiled in 5 min, then...

    Text Solution

    |

  19. The charge flowing through a resistance R varies with time t as Q = at...

    Text Solution

    |

  20. A 100 W bulb designed to operate on 100 V is to be connected across a ...

    Text Solution

    |