Home
Class 12
PHYSICS
An AC generator of 220 V having internal...

An AC generator of 220 V having internal resistance `r=10 Omega` and external resistance `R=100 Omega`. What is the power developed in the external circuit?

A

484 W

B

400 W

C

441 W

D

369 W

Text Solution

Verified by Experts

The correct Answer is:
B
`V=200V , r = 10Omega`
`R.=10+100Omega = 110 Omega`
`I=(V)/(R.)=(220)/(100)=2A`
`P=I^(2)R=4xx100=400 W`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    DISHA PUBLICATION|Exercise EXERCISE - 2 : Concept Applicator|29 Videos

  • ELECTROMAGNETIC INDUCTION

    DISHA PUBLICATION|Exercise EXERCISE - 2 : Concept Applicator|29 Videos

  • ELECTRIC CHARGES AND FIELDS

    DISHA PUBLICATION|Exercise Exercise - 2 : Concept applicator|24 Videos

  • ELECTROMAGNETIC WAVES

    DISHA PUBLICATION|Exercise Exercise - 2 : Concept Applicator|30 Videos

Similar Questions

Explore conceptually related problems

A cell of e.m.f. 2 V and internal resistance 2Omega and an external resistance 18Omega forms closed circuit. The current through the circuit is

The figure shows a source (a battery) with an emf E of 12 V with an internal resistance r of 2Omega and an external resistance of 4Omega is added to complete the circuit. What are the voltmeter and ammeter readings

In the electric circuit shown each cell has an emf of 2 V and internal resistance of 1Omega . The external resistance is 2Omega . The value of the current is (in A)

A battery is of emt E and internal resistance r . The value of external resistance R so that the power across eternal resistance is maximum :

A potentiometer wire of length 10 m and resistance 30 Omega is connected in series with a battery of emf 2.5 V , internal resistance 5 Omega and an external resistance R . If the fall of potential along the potentiometer wire is 50 mu V mm^(-1) , then the value of R is found to be 23 n Omega . What is n ?

An element with emf epsilon and interval resistance r is connected across an external resistance R . The maximum power in external circuit is 9 W . The current flowing through the circuit in these conditions is 3 A . Then which of the following is // are correct ?

The circuit diagram has two cells epsilon_(1) and epsilon_(2) with emf 4 V and 2V respectively, each one having an internal resistance 2 Omega . The external resistance R is of 8 Omega . Find the magnitude and the direction of current flowing through the two cells

Two cells having emf's of 10 V and 8 V, and internal resistance of 1Omega (each) are connected as shown with an external resistance of 8Omega Find the current flowing through the circuit.

DISHA PUBLICATION-ELECTROMAGNETIC INDUCTION -EXERCISE - 1 : Concept Builder
  1. Two circular coils can be arranged in any of the three situations show...

    Text Solution

    |

  2. Two coils, one primary of 500 turns and one secondary of 25 turns, are...

    Text Solution

    |

  3. Two circular coils, one of smaller radius r(1) and the other of very l...

    Text Solution

    |

  4. A long solenoid has 500 turns. When a current of 2A is passed through ...

    Text Solution

    |

  5. A metal disc of radius 100 cm is rotated at a constant angular speed o...

    Text Solution

    |

  6. A copper disc of radius 0.1 m rotates about its centre with 10 revolut...

    Text Solution

    |

  7. A square loop of side a is rotating about its diagonal with angular ve...

    Text Solution

    |

  8. A wire loop is rotated in a uniform magnetic field about an an axis pe...

    Text Solution

    |

  9. In an A.C. generator, when the plane of the armature is perpendicular ...

    Text Solution

    |

  10. The pointer of a dead-beat galvanometer gives a steady deflection beca...

    Text Solution

    |

  11. If a coil made of conducting wires is rotated between poles pieces of ...

    Text Solution

    |

  12. The armature of a dc motor has 20 Omega resistance It draws a currrent...

    Text Solution

    |

  13. When a metallic plate swings between the poles of a magnet

    Text Solution

    |

  14. A generator has an e.m.f. of 440 Volt and internal resistance of 4000 ...

    Text Solution

    |

  15. An AC generator of 220 V having internal resistance r=10 Omega and ext...

    Text Solution

    |

  16. A six pole generotar with fixed field excitation developes an e.m.f. o...

    Text Solution

    |

  17. The number of turns in the coil of an ac genrator is 5000 and the area...

    Text Solution

    |

  18. plane of eddy currents make an angle with the plane of magnetic lines ...

    Text Solution

    |

  19. The back emf in a DC motor is maximum when,

    Text Solution

    |

  20. A series would dc motor has a total resistance of 1.5 ohm. When connec...

    Text Solution

    |