Home
Class 12
PHYSICS
A bulb B is connected to a source having...

A bulb B is connected to a source having constant emf and some internal resistance. A variable resistance R is connected in parallel to the bulb. If the resistance R is increased, how will it affect the-
(a) Brightness of the bulb?
(b) Power spent by the source ?

Text Solution

Verified by Experts

The correct Answer is:
(a) Increases
(b) decreases
Promotional Banner

Topper's Solved these Questions

  • CAPACITOR

    ARIHANT|Exercise Capacitor|50 Videos

  • ELECTROMAGNETIC INDUCTION

    ARIHANT|Exercise Level 3|12 Videos

Similar Questions

Explore conceptually related problems

A bulb of 60 W is connected across a source of 240 V. Find the resistance of the bulb.

Cell having an emf epsilon internal resistance r is connected a variable external resistance R As the resistance R is increased the piot of potential difference V across R is given by

A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

A bulb of 40 W is connected across a source of 220 V . Find the resistance of the bulb.

2A cell having an emf epsilon and internal resistance r is connected across a variable external resistance R . As the resistance R is increased, the plot of potential difference V across R is given by

The brightness of a bulb will be reduced, if a resistance is connected in

The maximum power dissipated in an external resistance R, when connected to a cell of emf E and internal resistance r, will be

The power dissipated by a light bulb with 4 ohm resistance when connected in parallel to 12V battery is

ARIHANT-CURRENT ELECTRICITY-Current Electricity
  1. It was found that resistance of a cylindrical specimen of a wire does ...

    Text Solution

    |

  2. A cylindrical conductor is made so that its resistance is independent ...

    Text Solution

    |

  3. A bulb B is connected to a source having constant emf and some interna...

    Text Solution

    |

  4. In the circuit shown in the figure R(1) =3 Omega,R(2) = 2 Omega and R(...

    Text Solution

    |

  5. Find the equivalent resistance between point a and b in the network sh...

    Text Solution

    |

  6. In the circuit shown in the figure, the potential difference between p...

    Text Solution

    |

  7. An infinite network of resistances has been made as shown in the figur...

    Text Solution

    |

  8. Find equivalent resistance between points A and B in the figure. Each ...

    Text Solution

    |

  9. A fuse F(1) is connected across a source of variable voltage and the v...

    Text Solution

    |

  10. In the circuit shown in the figure. find I(1) and I(2).

    Text Solution

    |

  11. In the network shown calculate current through the cell (I1) and the c...

    Text Solution

    |

  12. In the circuit shown, R=2 Omega and V = 20 volt. With switch S open th...

    Text Solution

    |

  13. The box shown in the figure has a device which ensures that I(C) = 0.9...

    Text Solution

    |

  14. In the circuit shown in figure find the equivalent resistance across p...

    Text Solution

    |

  15. Find the percentage change in power supplied by the cell after the swi...

    Text Solution

    |

  16. A and B are two identical bulbs of 40 W connected to a V = 12 volt cel...

    Text Solution

    |

  17. Find equivalent resistance between points A and B in the circuit shown...

    Text Solution

    |

  18. Find current through the cell and potential difference between A and D...

    Text Solution

    |

  19. Eight identical 1 volt cells are connected to make a ring as shown in ...

    Text Solution

    |

  20. A battery of 120 V and internal resistance r = 0.5 Omega is used to ch...

    Text Solution

    |