Home
Class 12
PHYSICS
A 25 W, 220 V bulb and a 100 W , 220 V b...

A `25 W, 220 V` bulb and a `100 W , 220 V` bulb are connected in series across a `220 V` line , which electric bulb will glow brightly?

Text Solution

Verified by Experts

` 25 W` bulb will glow brighter. This is because `P = I^(2) R` where `I` is the current flowing and `R` is the resistance of the appliance. When `I` is same, `P prop R`. The resistance of `25 W` bulb is more and therefore `P` is more.
Promotional Banner

Topper's Solved these Questions

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Subjective|8 Videos

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Single Correct|60 Videos

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Solved Examples|13 Videos

  • GRAVITATION

    CENGAGE PHYSICS|Exercise Question Bank|39 Videos

  • INDUCTANCE

    CENGAGE PHYSICS|Exercise Concept Based|9 Videos

Similar Questions

Explore conceptually related problems

A 25 W , 220 V bulb and a 100 W , 220 V bulb are connected in parallel across a 440 V line

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across 440 volt line

A 25W-120V bulb and a 100W-120V bulb are connected in series across 120V line. Which bulb will be brighter?

There bulbs 40 W, 60 W and 100 W are connected in series to 220 V 4 mains. Which bulb will glow brightly ?

A 25 W, 220V bulb and 100W, 220V bulb are joined in series and connected to the mains. Which bulb will glow brighter-

CENGAGE PHYSICS-HEATING EFFECT OF CURRENT-Exercise 7.1
  1. Each of three resistors in fig. 7.12 has a resistance of 2 Omega and c...

    Text Solution

    |

  2. An electric bulb rated 220 V and 60 W is connected in series with anot...

    Text Solution

    |

  3. We have a 30 W, 6 V bulb , which we want to glow by a supply of 120 V ...

    Text Solution

    |

  4. Two heater coils made of the same material are connected in parallel a...

    Text Solution

    |

  5. A series circuit consists of three identical lamps connected to a batt...

    Text Solution

    |

  6. Two wires of the same material and having the same uniform area of cro...

    Text Solution

    |

  7. Water boils in an electric kettle in 15 min after being switched on . ...

    Text Solution

    |

  8. An electric motor operating on a 50 V dc supply draws a current of 12...

    Text Solution

    |

  9. A fuse with a circular cross - sectional radius of 0.15 mm blows at 1...

    Text Solution

    |

  10. A motor operating on 120 V draws a current of 2 A . If the heat is dev...

    Text Solution

    |

  11. The walls of a closed cubical box of edge 40 cm are made of a material...

    Text Solution

    |

  12. Two tungsten lamps with resistances R(1) and R(2), respectively , are ...

    Text Solution

    |

  13. n identical bulbs are connected in series and illuminated by a power s...

    Text Solution

    |

  14. An electric motor is designed to work at 100 Vand draws a current of ...

    Text Solution

    |

  15. A house is fitted with certain numbers of 100 W, 230 V incandescent la...

    Text Solution

    |

  16. A house is fitted with seven tubelights of rating 220 V, 40 W each , t...

    Text Solution

    |

  17. Two bulbs are marked 200 V, 300 W and 200 V, 600 W, respectively. The ...

    Text Solution

    |

  18. A servo voltage stabiliser restricts the voltage output to 220 V +- 1%...

    Text Solution

    |

  19. The efficiency of a cell when connected to a resistance R is 60 %. Wha...

    Text Solution

    |

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

    Text Solution

    |