Home
Class 10
PHYSICS
A circuit has a line of 5 A. How many la...

A circuit has a line of 5 A. How many lamps of rating 40W, 200V can simultaneously run on this line safely ?

Text Solution

Verified by Experts

Given V= 200 V,P = 40 W , I = 5A n= ?
mP = VI
`n=(VI)/(P) = (200xx5)/(40)`
`=(100)/(4)= 25` lamps
`:. 25` Lamps .
Promotional Banner

Topper's Solved these Questions

  • ELECTRICITY

    OSWAAL PUBLICATION|Exercise TOPIC-2 ( Long Answer Type Questions )|29 Videos

  • ELECTRICITY

    OSWAAL PUBLICATION|Exercise NCERT CORNER ( Intext Questions )|23 Videos

  • ELECTRICITY

    OSWAAL PUBLICATION|Exercise TOPIC-2 ( Short Answer Type Questions -I )|15 Videos

  • LIGHT-REFLECTION AND REFRACTION

    OSWAAL PUBLICATION|Exercise NCERT CORNER (TEXTBOOK EXERCISES)|15 Videos

Similar Questions

Explore conceptually related problems

An A.C. Source of 250 V, 50 Hz is connected to a circuit consisting of an electric lamp rated 100 W, 50 V and a capacitor in series. What should be value of the capacitance of the capacitor to make the lamp work at the rated value?

There are p intermediate stations on a railway line from one terminus to another . In how many ways a train can stop at 3 of these intermediate stations if no two of those stopping stations are to be consecutive ?

Several electric bulbs designed to he 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 220V line of the maximum allowable current is 5A ?

There are 2m horizontal lines equispaced at unit distance and 2n vertical lines equi- spaced at unit distance . How many rectangles can be formed such that the length of their sides is odd ?

OSWAAL PUBLICATION-ELECTRICITY-TOPIC-2 ( Short Answer Type Questions -II )
  1. A bulb is rated at 200V -40W. What is its resistantt ? 5 such bulbs ar...

    Text Solution

    |

  2. Three resistors of 10 Omega, 15 Omega and 20 Omega are connected in s...

    Text Solution

    |

  3. A circuit has a line of 5 A. How many lamps of rating 40W, 200V can si...

    Text Solution

    |

  4. Calculate the resistance of a 1 Km long copper wire of area of cross s...

    Text Solution

    |

  5. Study the following electric circuit and calculate the energy drawn fr...

    Text Solution

    |

  6. Study the following electric circuit (i) Calculate the current flowing...

    Text Solution

    |

  7. Calculate the amount of heat generated while transferring 90000 coulom...

    Text Solution

    |

  8. Study the following electric circuit and calculate the potential diffe...

    Text Solution

    |

  9. An electric heater is used on 220 V supply and takes a current of 5A. ...

    Text Solution

    |

  10. Find the effective resistance between the points A and B in the networ...

    Text Solution

    |

  11. Find the current drawn from the battery by the network of four resisto...

    Text Solution

    |

  12. ln the given circuit, calculate : (i) the total resistance of the ci...

    Text Solution

    |

  13. A torch bulb is rated 5 V and 500 mA. Calculate its (i) power, (ii) re...

    Text Solution

    |

  14. A lamp rated 60W and an electric iron rated 800W are used for 6 hours ...

    Text Solution

    |

  15. Draw a diagram to show how two resistors R(1) and R(2) are connected ...

    Text Solution

    |

  16. In a circuit if two resistors of 4 Omega and 8 Omega are connected in...

    Text Solution

    |

  17. A wire of resistance R is cut into five equal parts. These parts are t...

    Text Solution

    |

  18. Amongst iron, silver, nichrome, tungsten, copper, which metal / alloy ...

    Text Solution

    |

  19. Find the equivalent resistance across the two ends A and B of this cir...

    Text Solution

    |

  20. Calculate the amount of heat generated when 7200 coulombs of charge is...

    Text Solution

    |